LR308 Bolt Catch Travel

[freedom-lover]

Assembling a 308 lower - the bolt catch does not seem to have much travel compared to an AR. Does the spring need to be trimmed?

[FresnoCNC]

I assume you you mean your AR10 in comparison to an AR15. They are the same. Leave the spring alone

[freedom-lover]

I assume you you mean your AR10 in comparison to an AR15. They are the same. Leave the spring alone

Right - same plunger and the same spring, but the catch itself is a little bit bigger on the AR10/308. On this build, the catch only moves (pivots) like 1/8" (if that); on an AR15 it moves about 1/4".

[baih777]

the bolt catch lever itself is different between AR-15 and LR-308. sounds like you have the AR-15 lever installed.

Did you use a CMMG 308 LPK? they use the AR-15 lever instead of LR-308.

[jtyner]

I used a CMMG LPK in mine and had the same problem. I shortened the spring just a smidge and shortened the plunger just a bit, with a dremel, too since it was bottoming out.

[freedom-lover]

the bolt catch lever itself is different between AR-15 and LR-308. sounds like you have the AR-15 lever installed.

Did you use a CMMG 308 LPK? they use the AR-15 lever instead of LR-308.

Yes - it is a CMMG 308 LPK! Let me tell you - I am not impressed with their parts. The selector did not work (didn't have a positive detent feel) and I replaced it and now looks like their choice of bolt catch is questionable. I also had trouble with the magazine catch (threaded portion not long enough) and I fixed that with an AR10 catch. Oh yeah, and another thing - the CMMG bolt catch threaded pin would not fit into the forward boss. Also, the polished part of the trigger was machined with a 'trough' down the middle of it (it is not perfectly flat).

[baih777]

I am positive the catch is different. I keep a DPMS 308 lpk for.spare parts. I installed the one from that kit and if works fine.
Now I will look at the trigger.

[jfifer]

I've had issues with cmmg safety levers as well :/ it was such a pain to get a replacement too that i shy away from cmmg lpk's.

[wchutt]

I have had to mod 50 QD10 80% using the second step here:

http://www.calguns.net/calgunforum/showthread.php?t=650441

It has not mattered which bolt catch, the 308 bolt catch does protrude further out to manually engage the bolt though.

[wchutt]

I have had to mod 50 QD10 80% using the second step here:

http://www.calguns.net/calgunforum/showthread.php?t=650441

It has not mattered which bolt catch, the 308 bolt catch does protrude further out to manually engage the bolt though.

[freedom-lover]

I have had to mod 50 QD10 80% using the second step here:

http://www.calguns.net/calgunforum/showthread.php?t=650441

It has not mattered which bolt catch, the 308 bolt catch does protrude further out to manually engage the bolt though.

Thanks WChutt. My issues have been with the QD308 80%er as well, but I thought they were all related to the CMMG LPK quality. I'll check out that thread. Appreciate the help!

[freedom-lover]

New selector came in and it still doesn't work well. I think that Quentin Defense drilled the hole too far outboard for the detent pin. Also, the 308 specific bolt catch came in and while it has a tiny bit more travel than the AR15 one, it is not going to work. Looks like modification time. I will call QD up and get their opinion, too.