SMOS Precision build

[UWone77]

Well don't take notes from me, apparently I'm an idiot

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Oh, and for other people building using SMOS, your best bet for tightening the barrel nut is a crowsfoot wrench, size
1- 3/16. I ordered one off of amazon, but had to modify it with a grinder, because it was too wide to fit on the barrel nut.

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It's ok to merge these comments together.

[UWone77]

I've had better luck using a 1 1/4" wrench on my SMOS barrel nuts, this one is shown with a parallax barrel nut. You don't get exact torque numbers, but if you've installed a few hundred handguards, you get a feel for it.

As for the gas block I use Rainier Match Gas blocks for a reason. They are slightly larger ID wise specifically for SS or Match barrels. All I have to do is generously lube the barrel and slide the GB on.

[SINNER]

My apologies in this whole discussion...I was speaking from a recreational shooter's perspective. In any kind of service use, totally pin the GB. Because why not? I know, we're beating a dead horse.

I completely disagree with the "recreational shooter" mentality. I assemble every weapon like someone's life may depend on it one day. You never know where a weapon will wind up or what intended use is down the road. All gas blocks get pinned. 1/2 hour of effort and no downsides.

So I tried to start assembling my upper last night; all sorts of problems. First off, the Geissele gas black is giving me all sorts of hell. Couldn't get the gas tube pin in, it ate 2 pins before it finally somewhat took a 3rd, and its still not how I want it. Then, it doesn't want to seat on the barrel, its freaking tight as hell. Into the freezer it went last night, and is waiting until I get home. 3rd, and this is my boneheaded fault, as I should have freaking checked before torquing the barrel nut on, but the dust cover door is out of spec, and doesn't want to latch closed. It seems like its too small. This build is fighting tooth and nail!

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If the gas block is in the freezer you are backwards again. Lol barrel in freezer, gas block in oven at 300*. You want the block to expand not contract.

[UWone77]

I completely disagree with the "recreational shooter" mentality. I assemble every weapon like someone's life may depend on it one day. You never know where a weapon will wind up or what intended use is down the road. All gas blocks get pinned. 1/2 hour of effort and no downsides.



If the gas block is in the freezer you are backwards again. Lol barrel in freezer, gas block in oven at 300*. You want the block to expand not contract.

LOL good catch, I didn't even see that the first time I read it.

[Das Jared]

Well fuck me running!!! I quit. Hahaha

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[Pyzik]

I just want to say thanks to the OP. With all the attention you're getting they're bound to forget I installed a castle nut backward.

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[Das Jared]

It's ok to merge these comments together.

I will counter with I actually used a tq wrench, and you didn't, so nananana

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[SINNER]

I just want to say thanks to the OP. With all the attention you're getting they're bound to forget I installed a castle nut backward.

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Yeah, not happening.

[SINNER]

Well fuck me running!!! I quit. Hahaha

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LOL Don't quit. We need people to abuse around here too.

Seriously stick with it. We have all made mistakes, the goal is to learn from them.

[Pyzik]

LOL Don't quit. We need people to abuse around here too.

Seriously stick with it. We have all made mistakes, the goal is to learn from them.

Agreed. As stated, I'm into another build now too and I'm sure to goof setting up.

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[UWone77]

I will counter with I actually used a tq wrench, and you didn't, so nananana

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Only difference is... I know what I'm doing... and that didn't involve dremeling down a crows foot.

[UWone77]

But like SINNER said... we've all screwed up something... Just keep at it, and learn from your mistakes.

But then again at least I've never installed a castle nut backwards, or a muzzle device upside down.... which have all been documented here.

[SINNER]

Is milling the flats on the nut to fit a $50 Snap On wrench acceptable? Lol

[UWone77]

Is milling the flats on the nut to fit a $50 Snap On wrench acceptable? Lol

As long as you do it with a Snap on Dremel.

[SINNER]

But like SINNER said... we've all screwed up something... Just keep at it, and learn from your mistakes.

But then again at least I've never installed a castle nut backwards, or a muzzle device upside down.... which have all been documented here.

Or upside down gas tubes and other epic screw ups. LMAO