Lower Parts Kit

[Wake27]

Gotcha. I’m not saying it’s not true, just that out of the whole rifle, the LPK isn’t usually something people refer to as having high-stress.

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[MistWolf]

@RussB

Have you had experience with the RRA triggers?

What I did was fit the trigger to a particular lower. If RRA had chosen to use a set screw for that adjustment, it would be a simple thing to do. Some other 2-stage triggers have user adjustable features

AR triggers shouldn’t have to be fitted to a lower. The reason you had to grind on your disconnecter is because part of the FCG wore through the case hardening and to the softer material underneath and is now out of spec. Grinding on the disconnecter makes the situation worse because you now have another surface where the case hardening is gone. RRA 2 stage triggers have been known to wear to the point they double and triple. When they start that, they are just a few rounds from causing a run away

[RussB]

@MistWolf

AR triggers shouldn’t have to be fitted to a lower. The reason you had to grind on your disconnecter is because part of the FCG wore through the case hardening and to the softer material underneath and is now out of spec. Grinding on the disconnecter makes the situation worse because you now have another surface where the case hardening is gone. RRA 2 stage triggers have been known to wear to the point they double and triple. When they start that, they are just a few rounds from causing a run away

Thanks for the info…

Looks like a new FCG is in my near future. This may just be the excuse I need to get an SSA-E for that particular lower.

[Iraqgunz]

You’re not serious are you?

@RussB

Have you had experience with the RRA triggers?

What I did was fit the trigger to a particular lower. If RRA had chosen to use a set screw for that adjustment, it would be a simple thing to do. Some other 2-stage triggers have user adjustable features

[TehLlama]

@markm

Most of the critical components would be in the Geissele trigger. You can skimp a little on the rest. Not sure what available kits are out there less the trigger group. G&R has the Colts, but that’s over $60. I think Bravocompanyusa had complete DPMS in the $40s range. You probably don’t want their barrels or Bolt groups, but for the small parts of an LPK, you’re probably ok.

I’ve had some DPMS sourced LPK’s develop stupid tricks with the selectors and in-spec 2-stage triggers, it does work but it’s not confidence inspiring to have ran across those problems. You can still do better for a touch more money and mostly patience.

The RRA NM (2-Stage) is bad. Seriously, for that money get anything else, there are threads here on why - I didn’t think I’d have issues with the really low round count on mine, but it still is basically a garbage single stage already… TU in under 600rds had me wanting to break out the early 90’s EDM in our shop and see how much better I could do with no prints or idea what I’m doing, they’re that bad.

The DD LPK’s are trickier to find, but those are a solid value; when Grant is able to source enough LMT and other parts to make the G&R LPK’s happen those were absolutely unbeatable (especially with the G2S trigger option - I mean this was THE answer, I’m still grumpy I only have 4 G&R LPK’s and as many SSAs in those lowers). Even though the Colt is pricy, it’s excellent. I’d take the CMT (Stag) LPK over any of the other cheap answers (DPMS,CMMG,Spike’s,PSA) because they’re at least decent. I haven’t ran enough rounds through my Armalite LPK Lower to have a really useful opinion, but I only have it because of the deal I got on the thing - where I can find them now it’s still cheaper to go Colt/DD LPK and G2S so no reason not to do the latter.

LPK’s aren’t high stress items, but when they’re out of spec it’s a pain in the arse to sort out - especially for somebody new to the platform - so just spend an extra $10 on something that is a known quality setup and work from there, since it can cost that much in ammunition just to figure out why some small thing is going wrong. The trigger is the important part, but the G2S is every bit as good as the SSA in my sample size (one G2S, 5 SSA’s) so that’s an excellent candidate to keep the setup in budget.

[RussB]

@Iraqgunz

You’re not serious are you?

At the risk of looking foolish…Yes, I am serious. I’m trying to learn what I can

edit: just did a search and found a LOT of negatives regarding the RRA NM FCG. I’m taking that lower out of use until I replace the FCG

[RussB]

@MistWolf

AR triggers shouldn’t have to be fitted to a lower. The reason you had to grind on your disconnecter is because part of the FCG wore through the case hardening and to the softer material underneath and is now out of spec. Grinding on the disconnecter makes the situation worse because you now have another surface where the case hardening is gone. RRA 2 stage triggers have been known to wear to the point they double and triple. When they start that, they are just a few rounds from causing a run away

I didn’t see evidence that the RRA trigger group parts were case hardened. They appeared to hard all the way through. The engagement surfaced were indeed still quite hard, still too hard to be cut with a file which should be 52 R/C+. When I replace the RRA FCG, I’ll cut deep enough into the trigger casting and tack some rockwell measurements

I’m still serious

[Iraqgunz]

https://www.m4carbine.net/showthread.php?113430-First-precision-trigger-RRA-NM-Gieselle-SSA-LMT-2-Stage-or

https://www.m4carbine.net/showthread.php?60395-Your-thoughts-on-RRA-parts-kits-for-lowers

https://www.m4carbine.net/showthread.php?28640-rra-2-stage-trigger

https://www.m4carbine.net/showthread.php?75324-Triggers-single-stage-or-two-stage

https://www.m4carbine.net/showthread.php?99880-quot-Un-suckifying-my-RRA-quot-build

@RussB

At the risk of looking foolish…Yes, I am serious. I’m trying to learn what I can

edit: I’m having a tough time searching and finding any info regarding the RRA NM trigger here?

[RussB]

Thanks!

[Theblakester03]

Primary arms is legit. Very high quality for the price.

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[outlawturtle]

Spikes makes some nice LPKs as well. I have both the enhanced and standards in a few of my ARs and have had no issues. I’ve also had no issues with my RRA 2 stage trigger and LPK with several thousand rounds through the AR, but apparently these are hit or miss.

-OT

[Cold_Bore]

I just bought Colt 3 lpks from G&R tactical. With the way things are going for Colt. Thought I’d stock up just in case.