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UWone77
5 November 2014, 11:58
Most of my carbines are general use oriented. 14.5 - 16" guns that are used for training, plinking, loaning, ect. I've never really built a 5.56 gun with strictly precision in mind. In fact when I think about it, my .308 builds are not really precision oriented either.

Anyhow, when I received my Rainier Arms Mod2 Billet Set, I set out to start building an accurate 18" blaster. So far here's the upper:

Rainier Arms Mod2 Billet Upper
Rainier Arms Ultramatch 18" SPR Barrel (Rifle Gas)
Rainier Arms Match NiB BCG
Rainier Arms Gen2 FORCE Rail 15"
Rainier Arms Raptor
Geissele Super Gas Block Pinned


http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2544_zps0f0f20ff.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2544_zps0f0f20ff.jpg.html)
http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2539_zps944d09dd.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2539_zps944d09dd.jpg.html)
http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2541_zps04fe8228.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2541_zps04fe8228.jpg.html)


Played around with the muzzle devices between the RAC and Epsilon. I think I want to go with a brake on a 18" possibly a suppressor mount. We'll see.

More to come as this progresses.

Ride4frnt
5 November 2014, 12:47
Trade ya my 15" gen1 force!

Looks good. Are you sticking with the epsilon or the RAC?

WHSmithIV
5 November 2014, 13:02
I've been thinking of what would make a good precision build. Something I could shoot a mile with reliably. I figure 6.5 Grendel is likely the best for that since it's still supersonic passing 500 yards and passes a .308 bullet at that distance. It's designed to be accurate to 800 yards. So, I've been toying around with starting a build for that.

UWone77
5 November 2014, 13:14
I've been thinking of what would make a good precision build. Something I could shoot a mile with reliably. I figure 6.5 Grendel is likely the best for that since it's still supersonic passing 500 yards and passes a .308 bullet at that distance. It's designed to be accurate to 800 yards. So, I've been toying around with starting a build for that.

I had a 16" 6.5 barrel earlier this year I was thinking about using, but ended up giving it to a buddy who really wanted it more than I did, and reloads.

If I do a 6.5 down the road, I think it's going to be a Creedmore.

WHSmithIV
5 November 2014, 13:37
I have to research it more for the Grendel vs. the Creedmore. I'll also have to set up for reloading due to the cost of the ammo. So, it's a project for down the road.

Computalotapus
5 November 2014, 13:47
I am starting a .308 build here soon as well. Will be insteresting to see how your build comes out. Doing an 18" SPR barrel as well.

JoshAston
5 November 2014, 13:48
Creedmore is based on .308, so you'd need a .308 sized platform for it. Grendel is based on 7.62x39, I think, maybe .220 Russian. It fits in an AR15. Obviously the Creedmore outperforms the Grendel by a decent margin, launching heavier bullets at higher velocities. My personal favorite is .243 out of a 1/8" twist barrel. It will outperform anything in its class quite handily.

UWone77
5 November 2014, 13:50
Creedmore is based on .308, so you'd need a .308 sized platform for it. Grendel is based on 7.62x39, I think, maybe .220 Russian. It fits in an AR15. Obviously the Creedmore outperforms the Grendel by a decent margin, launching heavier bullets at higher velocities. My personal favorite is .243 out of a 1/8" twist barrel. It will outperform anything in its class quite handily.

Exactly, which is why I'd want a Creedmore build if I went with 6.5. I have enough AR15 receivers so, if I wanted to venture out into a different caliber, 6.5 Creedmore is where I'd want to drift towards... and the other reason I dumped my Grendel Barrel. Although I was impressed with the ballistics.

mustangfreek
5 November 2014, 13:50
Nice build as always Poobah...(wtf...lol)..... everywhere i look guys have this killer receiver set...uhhhh

Anyways, good looking stuff there, decided on optics ?


The debate for creedmoor,grendel,260 etc is for another thread..There are plus and minuses to them all, and not an expert but have been looking at al lthe numbers for them for a while.

alamo5000
5 November 2014, 16:53
First a question... what will be your choice of optic for this?

My current build has 'precision' component in mind as well... hopefully you will see pics of the completed rifle within a week.

I have just some random comments though based not around AR, but around shooting in general...what is the twist rate of your barrel?

I am the last one to be doling out advice but I will just make random comments. Matching the round down to the grain weight makes a huge difference in shooting precision. The type of barrel is probably one of the most important parts. I would also say trigger is probably a close second most important for precision. What kind of trigger are you considering?

What distance are you talking 'precision' at and what would you define as satisfactory when using the term 'precision'? And at what distances?

I have had all these questions rolling around in my head for quite some time (like a year or two) contemplating my build... and it's pretty much coming to fruition. We have the same goals here... I got to my conclusions by asking a lot of questions from a lot of people, but I am asking how you have thought through your build...so please do share as I am quite curious.

GaSwamper
5 November 2014, 17:43
Outstanding upper you're putting together there UW. Too bad we're on separate coasts, I may would have to let the 18'' Wolverine upper challenge you're 18'' 5.56. As far as a larger platform to build on for the big boy cals I'm eager to see ARPerformance's NexGen scheduled to be ready next year. ARP says it will offer .308 and .260 to start with more to follow in a 7.5lb platform.

Pyzik
5 November 2014, 17:54
That's gonna be a nice rifle.

After my pistol k am wanting to do a precision build. Wanting to go billet for it as well.

Looking forward to following this build.

Ride4frnt
5 November 2014, 18:00
That's gonna be a nice rifle.

After my pistol k am wanting to do a precision build. Wanting to go billet for it as well.

Looking forward to following this build.

Boy you won't regret that. The 18" gun I just built is so fun.

UWone77
6 November 2014, 16:04
Trade ya my 15" gen1 force!

Looks good. Are you sticking with the epsilon or the RAC?

Good question, at this point, I don't know.

Nothing wrong with the Gen1 Force you know, this is the same rail, just slanted. Do you really need that? [:D]


First a question... what will be your choice of optic for this?

My current build has 'precision' component in mind as well... hopefully you will see pics of the completed rifle within a week.

I have just some random comments though based not around AR, but around shooting in general...what is the twist rate of your barrel?

I am the last one to be doling out advice but I will just make random comments. Matching the round down to the grain weight makes a huge difference in shooting precision. The type of barrel is probably one of the most important parts. I would also say trigger is probably a close second most important for precision. What kind of trigger are you considering?

What distance are you talking 'precision' at and what would you define as satisfactory when using the term 'precision'? And at what distances?

I have had all these questions rolling around in my head for quite some time (like a year or two) contemplating my build... and it's pretty much coming to fruition. We have the same goals here... I got to my conclusions by asking a lot of questions from a lot of people, but I am asking how you have thought through your build...so please do share as I am quite curious.

This is a Rainier Arms Ultramatch, so it has a 1:8 twist.

This should ring steel all day with no problems at 600 yards, which is the max range I can find in my area. The last 16" Select Barrel I tested was about 1.1 MOA (for my level of shooting at 300) so this should do better with the ratchet rifling and additional velocity with the extra length.

Trigger will be a Geissele National Match DMR. Also have a SSA-E in my bin, but that's probably going on the SBR.

As for the optic. No idea yet. We'll see how it develops.



http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2538_zpsa2abaa69.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2538_zpsa2abaa69.jpg.html)

alamo5000
6 November 2014, 17:46
This should ring steel all day with no problems at 600 yards, which is the max range I can find in my area. The last 16" Select Barrel I tested was about 1.1 MOA (for my level of shooting at 300) so this should do better with the ratchet rifling and additional velocity with the extra length.

1.1 MOA at 300 is pretty darn good.

Around where I live in East Texas it's heavily forested so getting the long shots is not all that common. 200 -300 yards is pretty much what you're going to get around here. That said right up the road there is a formal range (15-20 minutes) that is at least 600 yards, and another 10 more minutes after that a friend has a private 1,400 yard range that I can use for free...That said on my AR build the sweet spot I am aiming for is 200 yards inward.

toolboxluis00200
6 November 2014, 18:52
Most of my carbines are general use oriented. 14.5 - 16" guns that are used for training, plinking, loaning, ect. I've never really built a 5.56 gun with strictly precision in mind. In fact when I think about it, my .308 builds are not really precision oriented either.

Anyhow, when I received my Rainier Arms Mod2 Billet Set, I set out to start building an accurate 18" blaster. So far here's the upper:

Rainier Arms Mod2 Billet Upper
Rainier Arms Ultramatch 18" SPR Barrel (Rifle Gas)
Rainier Arms Match NiB BCG
Rainier Arms Gen2 FORCE Rail 15"
Rainier Arms Raptor
Geissele Super Gas Block Pinned


http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2544_zps0f0f20ff.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2544_zps0f0f20ff.jpg.html)
http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2539_zps944d09dd.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2539_zps944d09dd.jpg.html)
http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2541_zps04fe8228.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2541_zps04fe8228.jpg.html)


Played around with the muzzle devices between the RAC and Epsilon. I think I want to go with a brake on a 18" possibly a suppressor mount. We'll see.

More to come as this progresses.
holy cow that looks killer

Slippers
6 November 2014, 19:09
Rainier certainly has some really nice looking billet receivers these days. The new force rail is also pretty spiffy. It has to be super light with the huge cutouts.

mustangfreek
7 November 2014, 04:47
Wheres the pics of the lower......[BD]

What stock your planning on using?

UWone77
7 November 2014, 08:41
Wheres the pics of the lower......[BD]

What stock your planning on using?

We're slowly packing for a December move, so I'll get a picture in when I can of the lower.

I'm going to use a Magpul PRS for the stock.

SINNER
7 November 2014, 09:02
Although I am speaking about the .308 version those Rainier Ultra-match barrels are some of the nicest made barrels I have seen. The chamber is a work of art.

I really need to up my photography game to post any pics around here. LOL

That upper is a work of art.

Stickman
8 November 2014, 08:30
Looks Good!

UWone77
8 November 2014, 13:39
I can't decide whether to go with an entirely new optic, or just cannibalize an existing upper for the optic. Can never have enough optics, but then again, $$$

Ride4frnt
8 November 2014, 13:50
I can't decide whether to go with an entirely new optic, or just cannibalize an existing upper for the optic. Can never have enough optics, but then again, $$$

Those pesky $$$ will get ya.

Ordnance
9 November 2014, 11:41
Something I could shoot a mile with reliably.

There is no such thing as reliable at a mile. And most supersonic rounds do not go transonic shortly after 500yds, for instance most 308's you're looking at 1k+yds depending on your barrel length and load. Hell, I've taken my SPR with an 18" BBL and factory 77SMKS out to 900+ even though they were going transonic at around 800+ but it doesn't matter because the round remained stable and bucked the wind better.

Even so if that is your goal then you'll want to look at a magnum cartridge and a bolt since it can handle higher pressures. Your best best would also be a magnum cartridge with a nice gain twist barrel and a heavier pill in something like a 7mm Rem Mag, 6.5CM SAUM, 300WM, or 338 Lapua/Norma/Edge since they're designed for better performance beyond 1K+. The 6.5 Grendel is a great round, but beyond 1K+ its performance will not stand up to the wind as reliably as a heavy.

Ordnance
9 November 2014, 11:47
We're slowly packing for a December move, so I'll get a picture in when I can of the lower.

I'm going to use a Magpul PRS for the stock.

You don't necessarily need the PRS if you're building out a small frame. I have a UBR on my SPR with a ADM mount and I get a perfect cheek weld. On larger frame AR's because of their design it often requires a higher comb, but on he small frame it isn't necessary most of the time.

UWone77
10 November 2014, 11:38
You don't necessarily need the PRS if you're building out a small frame. I have a UBR on my SPR with a ADM mount and I get a perfect cheek weld. On larger frame AR's because of their design it often requires a higher comb, but on he small frame it isn't necessary most of the time.

Oh but it is necessary.

I have an extra PRS collecting dust. vs I'd have to go buy a UBR. [:D]

Ride4frnt
10 November 2014, 11:49
Oh but it is necessary.

I have an extra PRS collecting dust. vs I'd have to go buy a UBR. [:D]

Ha! That's why my 18" has a A2 stock and not a PRS. I will say the A2 stock grew on me a lot more than I thought it would. Still needs replaced.

Ordnance
10 November 2014, 11:52
Oh but it is necessary.

I have an extra PRS collecting dust. vs I'd have to go buy a UBR. [:D]

LMAO... Good point!

UWone77
25 November 2014, 00:12
Thought I'd update some of my build threads.

Haven't put my PRS on, and waiting on my trigger, and a BAD 45 degree selector to come back into stock. Most of my projects will be taking a backburner for the rest of the year as I'm packing up to move.


http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2596_zps42979e40.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2596_zps42979e40.jpg.html)
http://i1016.photobucket.com/albums/af282/richdkim77/IMG_2593_zps1cedd7c0.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_2593_zps1cedd7c0.jpg.html)

DutyUse
25 November 2014, 01:01
Have you used the Rainer extended mag much? Thoughts?

UWone77
25 November 2014, 10:03
Have you used the Rainer extended mag much? Thoughts?

I have one on a forged set, which works a lot better than on this billet one. Too much material around the magazine release, partially blocking from depressing all the way. It still releases the magazine however. I don't know how much "better" it is, but I know for instance, if you're a gamer, a fraction of a section faster on reloads could help. For a $15 part, you can always try one out without breaking the budget and see if you like it. The texture on the button is nice.

DutyUse
25 November 2014, 10:36
I have one on a forged set, which works a lot better than on this billet one. Too much material around the magazine release, partially blocking from depressing all the way. It still releases the magazine however. I don't know how much "better" it is, but I know for instance, if you're a gamer, a fraction of a section faster on reloads could help. For a $15 part, you can always try one out without breaking the budget and see if you like it. The texture on the button is nice.

Thanks for replying. Your right though probably just need to try one for myself :D

UWone77
21 February 2015, 00:57
I know I haven't updated this in awhile. I finally started working on this project again. This is not as exciting since SeattleDude already has his SPR built up and basically has a similar configuration.

Updated with the Geissele DMR Trigger. I'll install some BAD-EPS Pins and a Magpul PRS this weekend.

http://i1016.photobucket.com/albums/af282/richdkim77/IMG_3026_zpse1nlkaeg.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_3026_zpse1nlkaeg.jpg.html)

Farva
21 February 2015, 05:09
I know I haven't updated this in awhile. I finally started working on this project again. This is not as exciting since SeattleDude already has his SPR built up and basically has a similar configuration.

Updated with the Geissele DMR Trigger. I'll install some BAD-EPS Pins and a Magpul PRS this weekend.

http://i1016.photobucket.com/albums/af282/richdkim77/IMG_3026_zpse1nlkaeg.jpg (http://s1016.photobucket.com/user/richdkim77/media/IMG_3026_zpse1nlkaeg.jpg.html)

I love the ambi lowers from Rainier. So sexy looking. One is on my short list for sure!

SeattleDude
21 February 2015, 12:32
Looks great! Does RA mag release clear the lower well when depressed?

UWone77
21 February 2015, 12:42
Looks great! Does RA mag release clear the lower well when depressed?

Barely...

If this was a hard use, general carbine, I'd probably just replace it with a mil-spec release.

Since there won't be many mag changes on the fly, I'll just see how this one goes and replace as needed.