is it a les baer? if so why doesn't it work?

[Cincinnatus]

With that staking, unless you have a MOACKS, it's not worth fiddling with anyway--unless you just want to wrangle with it out of sheer mechanical curiosity.

[sinlessorrow]

The first thing I noticed was the lightening grooves cut into the side of the bolt carrier. Is that an older JP low mass bolt carrier or a low mass bolt carrier made by another company? If it is, it may require a lighter buffer/spring assembly to function correctly.

You may want to weigh the bolt carrier and compare it to the weight of another bolt carrier without the lightening grooves.

Those are not lightening cuts. Those are the same height as the normal carier rails....essentially extra carrier rails.

[T2C]

Those are not lightening cuts. Those are the same height as the normal carier rails....essentially extra carrier rails.

What is the purpose of the extra rails?

[MistWolf]

What is the purpose of the extra rails?

To give you more room to mount lights, slings, optics and other accessories. They're supposed to showcase a keymod version at SHOT

[sinlessorrow]

What is the purpose of the extra rails?

Honestly? It looks to me like they were just quicker to machine.

[markm]

Yes. That is a Les Baer. I'm running one in a gun and it runs fine.

[gotuinmysights]

rings are tight, it passes the old stand on end test.

When the rifles short stroke at Windham the first thing I did was to place the in question BGC on a table bolt face down with the bolt pushed into the carrier and held at a angle. You want to spay some WD-40 in the gas key a pretty good amount so it starts to come out. put a rubber tipped air chuck with a v pattern in the tip on to the gas key so it seals it up when pushing down. Spray compressed air into the key and watch the bottom of the key and the top of the mounting area on the carrier. You should have very little WD-40 spraying out ...if it spraying out all over the place around the key you have bad contact surface area points . There is your cause of short stroking, that's of coarse if your rings and other areas of the carrier are good. (also make sure that your gas key is not oversized or it will leak around the gas tube when the rifle is being fired also causing a short stroke.

[RichinVA]

Any resolution to this?

[Swstock]

Why waste anymore time with the crap? Buy a BCM BCG and spend time shooting and not posting threads about something that doesn't work.

You beat me too it.

[RichinVA]

Quite the 'technical' response. I'd rather know why, even if I chucked it anyway. It's very surprising to find a defeatist attitude on this type of discussion. A sad commentary.....

OP, if you figure it out, please let me know. Thanks.