Help needed with Bolt Carrier

[best45auto]

Hi I bought a stripped bolt carrier then the key with the screws to install and stack my self but one of the screws broke on the bolt carrier. I try to drill it out but is pita
• Anybody out there have the right tools to extract the broke screw, please let me know I am located in the bay area thanks.

[Dan FS71]

Use a center drill.

[ar15barrels]

Use a left hand drill bit without cutting oil.
When the drill bit grabs, the screw comes zipping out.

[NewbieDave]

Yeah, go slow... and when you do get it out, remember... 58 inch/lb is all you need to attach those gas-key screw.

dpc

[ar15barrels]

Yeah, go slow... and when you do get it out, remember... 58 inch/lb is all you need to attach those gas-key screw.

dpc

35 inch-lb is the spec.

[Cheep]

If it isn't cross threaded or locktighted, you might be able to get it to move with an automatic center punch, otherwise...drill.

[Hoagiem]

Will the other screw go into the other hole? That happened using a socket key to tighten it by hand?

[6mmintl]

You need to:

Try backing out with a sharp punch and hammer.

Or:
Drill a small hole is the screw in a milling machine with a rigid fixture or vise then use an easy out .

Most likely the screw is heat treated and a hand drill will walk possible drilling partially into bolt carrier depending on which is harder.

Im in redwood city/peninsula and can help today if needed.

[best45auto]

thanks everyone for their input.

[best45auto]

Will the other screw go into the other hole? That happened using a socket key to tighten it by hand?

the other screw and hole are ok and you right i used a socket key to tighten the screw when it broke

[Cobrafreak]

When you get it out and install, remember to peen the allen head bolts to the gas check so they will never back out. You peen then at the 9:00 & 3:00 position on each bolt head.

[kcstott]

Bolt carriers and keys are pretty darn hard so the threads won't stretch or pull out. So yeah you can (and it does happen) shear off a screw by hand.
Develop a feel or get a torque wrench

[edgerly779]

Randall beat me to it a left hand drill and worst case heat the carrier to 200 degrees in the oven after starting drill hole slightly.

[NewbieDave]

Yeah, I know mil-spec is 35-40 inch/lb... but I've been following advice from this Armalite note from a while back and also something that Young Mfg posted about how they install their gas-key when they got questioned about not-staking their keys.

Armalite PDF

Reposting from Young's site:

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dpc