Short stroking?

**patrick sweeney** · 02-28-13, 13:45

While you're at it, check the carrier key.

I swear one of these days I'm going to start tack-welding the damn things on, just to keep them from coming loose.

**markm** · 02-28-13, 13:48

Originally Posted by patrick sweeney

While you're at it, check the carrier key.

I swear one of these days I'm going to start tack-welding the damn things on, just to keep them from coming loose.

Are your keys staked?? I've never seen a properly staked key come loose... I had a bolt break which caused gas leaking... but have only seen loose keys on unstaked carriers.

**patrick sweeney** · 02-28-13, 13:55

I've seen un-staked, marginally staked, and properly staked ones come loose. I'll have to admit that the ones that were properly staked, that came loose, did so because one of the screw heads broke.

A second-semester Engineering student who submitted a design like the attachment method of the carrier key would get a failing grade from his/her professor, and rightly so.

The only way worse would be to use duct tape.

But, we're verging off-topic.

**markm** · 02-28-13, 14:05

Originally Posted by patrick sweeney

But, we're verging off-topic.

It's ok.. it's good info. PLUS.. it could be part of the guy's problem above. A busted bolt can be a trick to find. Mine even stumped Specialized Armament when I took it in.

**HwyKnight** · 02-28-13, 14:30

Attachment 15660

Look at the buffer & spring on the right. See how the spring doesn't fully seat onto the buffer as compared to the other two? This translates into about 1/8 less travel for the BCG. The only way I could get the bolt to lock back with the one on the right was if I pulled it clear by hand. It was just clearing the bolt catch when I did this. Switching to either of the other two allowed the extra travel on the BCG. Now I just need to get to the range to burn a few rounds and confirm. As I said in previous posts, the lower and it's components is the only variable here, the upper, and mags are all tried and true on other ARs. Thanks for all your help and input on this. I did inspect all the mentioned components on the upper, and it is gtg. I'll follow up again after a range test.

**markm** · 02-28-13, 14:33

Well that's a new one to me.

**patrick sweeney** · 02-28-13, 14:41

Any markings on that buffer weight? Any idea where it came from?

And can the spring be roved down over the secondary shoulder, to create a more-correct assembled size?

**markm** · 02-28-13, 14:43

Yeah... I mean.. that's what I have to do any time the buffer is separated from the spring. I'd have guessed that the first time you fired it the spring would have snapped into proper position over the buffer.