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View Full Version : Eotech won't fit on seekins 223 upper



stihl2much4u
9 November 2014, 13:49
I have been baffled as to why my eotech wouldn't fit on my seekins upper. So I dragged out the calipers. Here are some pictures.

1. Sig 716 21.14mm
2. Fortis Rail 21.00mm
3. Northtech defense upper 21.18mm
4. Seekins 223 upper 21.40

Picatinny rail specs call for 21.20mm

any suggestions? Grinder?

http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_162018_zpsta2mf42v.jpg
http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_162708_zpsv0bxiibt.jpg
http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_162207_zpsowhwzgic.jpg
http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_162421_zpsaavutnwi.jpg

UWone77
9 November 2014, 13:52
What model EoCrap?

stihl2much4u
9 November 2014, 14:13
You can say that again. I hate the f-ING thing. Model 512

I'd sell it if I could get my money out of it

stihl2much4u
9 November 2014, 14:16
The good news is that I figured out how to use photobucket

alamo5000
9 November 2014, 14:58
I learned something new today (the actual spec for mil spec rails)...

The Eotech won't open up any wider than that to still fit on the rail?

stihl2much4u
9 November 2014, 15:06
Alamo, sadly no. The metal frame underneath is just shy of the needed width

UWone77
9 November 2014, 15:06
It's been awhile since I owned a 512, but can you open the clamps underneath and get it a bit wider?

alamo5000
9 November 2014, 15:14
Alamo, sadly no. The metal frame underneath is just shy of the needed width

Can you put up a pic of the base of the Eotech? (facing inside of it)? Try to show which points are making contact.

Might be a better idea to mod the optic vs try to mod the rail. You always can (and will) end up getting new optics.... and plus if you say shave a little off of the underside of the eotech it won't be as cosmetic than working on the whole rifle.

EDIT: If this was something other than an Eotech I probably would not suggest this [:D]

stihl2much4u
9 November 2014, 15:35
http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_183202_zpsxcm7tbmj.jpg

http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20141109_183117_zps2nfkiqc8.jpg

stihl2much4u
9 November 2014, 15:37
I could probably Dremel the metal base of the eotech and shave off a little

Calico Jack
9 November 2014, 15:44
Maybe it's just me but the seekins seems to be the problem. Try a GG&G throw lever. It may give you the clearance you need. I got one from botach two years ago for 20 bucks.

alamo5000
9 November 2014, 16:05
I could probably Dremel the metal base of the eotech and shave off a little

This could be an option but surgery is after all, surgery. If it were me I would try to figure out where exactly is making contact and focus there. It's not like you have to take off a lot.

Also don't they make QD plates for these kinds of Eotech's?

(EDIT:
http://www.youtube.com/watch?v=el2pU33W_V4)

Another option is to throw that sucker on gunbroker and get what you can get and then invest in something else optics wise.

VIPER 237
9 November 2014, 16:44
Why not contact seekins before attempting surgery? If their upper is out of spec they will want to hear about it as it gives them information for their QC division.

UWone77
9 November 2014, 16:45
Why do people insist on shaving metal before contacting the manufacturer?

alamo5000
9 November 2014, 16:48
Why do people insist on shaving metal before contacting the manufacturer?

Touche'

UWone77
9 November 2014, 16:50
Touche'

I probably put together over 100 AR's.... I don't even own a dremel. [:D]

Dstrbdmedic167
9 November 2014, 17:01
I had to slide my eotech on from the back near the charging handle and then clamp down on one of the receivers I had at one point. Mine wouldn't go on from the side but would this way...

Eric
9 November 2014, 17:09
I've installed a bunch of EOTech's and never seen that. This should be easy. The part that is out of spec should be replaced by the manufacturer. It looks like 1913 rail specs (top max width) are .835" (21.209 MM).

Stone
9 November 2014, 19:23
Stick the upper in the freezer for an hour, that'll shrink her down to mil spec. Then quickly slap the eotech on it...[BD] For $240 that upper better be on the nuts. Call Seekins.

Ordnance
9 November 2014, 19:29
JB Weld and duct tape...

stihl2much4u
10 November 2014, 02:42
I sent seekins an email.

stihl2much4u
10 November 2014, 02:53
Why do people insist on shaving metal before contacting the manufacturer?

This is a picture of a magazine release for a San Tan lower that I've had for 6 months or so. It stopped releasing magazines for some odd reason so I pulled the mechanism apart this is what I found. I contacted the manufacturer and they promised to send me a new one....2 or 3 months ago. So I welded it back together myself and now it works. I agree contacting the manufacturer is always best, but they are under no obligation to come through.

http://i1293.photobucket.com/albums/b581/stihl2much4u/Mobile%20Uploads/20140929_113853_zpsinqvkkrs.jpg

markm
10 November 2014, 05:07
Maybe it's just me but the seekins seems to be the problem.

Seeking IS the problem. I have two of their garbage lowers. Not the Billet Trash, but the forged ones. Magwells are tight, buffer detent isn't positioned right... They're functional, but they'll be replaces with quality lowers this year.

alamo5000
10 November 2014, 16:15
1. Sig 716 21.14mm
2. Fortis Rail 21.00mm
3. Northtech defense upper 21.18mm
4. Seekins 223 upper 21.40

Picatinny rail specs call for 21.20mm



This made me very curious about my own gear so I measured.

My CMT UPR4 upper is exactly 21.20mm
My SLR Rifleworks rail is 20.675mm (.5mm shy of being exact)

Given, my calipers are old and manual and only use inches and they also have to be manually calibrated, so I had to eyeball it and use google for the conversion...but that's what I came up with.

UWone77
10 November 2014, 16:17
This is a picture of a magazine release for a San Tan lower that I've had for 6 months or so. It stopped releasing magazines for some odd reason so I pulled the mechanism apart this is what I found. I contacted the manufacturer and they promised to send me a new one....2 or 3 months ago. So I welded it back together myself and now it works. I agree contacting the manufacturer is always best, but they are under no obligation to come through.



Did you follow up?

Ride4frnt
10 November 2014, 16:21
I can tell you from my experience, my seekins BAR is tight too. My front mbus on that rail will not flip up without a bit of persuasion, however the back one on a PSA stripped upper will flip up freely.

GaSwamper
10 November 2014, 18:29
Why do people insist on shaving metal before contacting the manufacturer?

Where's your adventures spirit UW?

UWone77
10 November 2014, 18:37
Where's your adventures spirit UW?

[:)] I've seen some interesting "gunsmithing" work over the years.

stihl2much4u
11 November 2014, 04:16
Did you follow up?

Didn't bother, I fixed it. The welded one will be stronger anyway. No dremel needed :)

stihl2much4u
11 November 2014, 05:44
Despite the crappy mag release, I must concede that dennis at San tan is probably the nicest weapons manufacturer I've ever spoken too. I'd buy more from him just based on that

Kopis
12 November 2014, 14:34
Ive got a seekins lower and love it. It has the mag release via allen key instead of roll pin and several trigger adjustment allen key pieces already installed. Great lower. Like others have said, if it's out of spec, id contact them. Id like to hear about their service/response.

stihl2much4u
13 November 2014, 05:24
I sent them an email last week. Still nothing. I'm going to call today

stihl2much4u
18 November 2014, 16:37
Update: They wanted me to ship the upper plus optic to them for inspection. I cut the chase on a likely drawn out period of time without a working rifle and gently shaved my eotech to meet the upper. My findings were that military specs call for .830-.835" on the width of the picatinny rail. The seekins was .839-.841 depending on where the measurement was taken. The eotech, made to tight tolerances wouldn't fit. On the bottom of the eotech, I shaved out a thin strip to allow it to fit. The eotech still fits smaller rails like the sig rail and the smallest rail, the fortis. Northtech Defense had the best machining. If you look at the mil specs for the picatinny you see the measurements on top as (.835 - .005. ) I'm assuming some folks may have taken that -.005 as a measurement for tolerance in either direction. Its not. Its simply a minus, meaning acceptable values are .830-.835.