BCG Screws, how tight?

[Team Helotes]

I am putting together a DPMS BCG for my new build.  How tight do I tighten the screws before pinging them in place?

[survivalshop]

According to TM9-1005-249-34 Tech. manual its 35-40 inch pounds.

[Robocop1051]

I've always bought my BCG's complete. How do you pin the screws? I assume either a hammer and punch or maybe an arbor press. Pinning seems so permanent, why not weld?

[Team Helotes]

Thanks Shop.

[survivalshop]

The screws are staked in place . The old method was three punch marks around the screw heads ,evenly spaced . The new method is on the out side of the screw head forcing carrier material against the screw head .

There is a hand press out there some where that uses a vice like fixture to do this . I still use some kind of punch.

Some use loc tite also , insted of staking .

When I looked up that torque setting , I read a note next to it that read , "make sure bolt carrier is supported when staking , a bent carrier can result if not doing so ", what would some one use to stake the key screws , a sledge hammer ?

AHH ,but it is an Army manual . 1968 vintage.

[98Z5V]

MOACKS.  Mother Of All Carrier Key Stakers.  Seriously. 

http://www.m-guns.com/tools.php

[Matt.Cross]

When I got my Young Mfg bolt carrier, they told me that blue loctite and cranking it down as much as I could by hand would be plenty sufficient, they don't stake their carrier keys. I don't know how advisable that is, but they are the manufacturer, and I haven't had any problems so far.

[unforgiven]

Brother Tom checked out that link you put down,that light mount for the A2 FS is the best I have ever seen.Never liked the A2 type[only flip up] but that setup changed my mine.

[survivalshop]

MOACKS.  Mother Of All Carrier Key Stakers.  Seriously. 

http://www.m-guns.com/tools.php

That's the one , I couldn't remember the name .

My chisel tip punch works just as good & cheaper ,but that tool is nice.

Ya , Young's give some good reasons for not staking them , but I still do it.