Lower pain in my @ss.

AR/M4 AR Technical Discussion
1

So here’s where I’m at. I’ve got an LMT lower that I’ve had sitting around for a couple years. I set it up with an ambi-safety, ergo grip and Alexander Arms trigger.

After installing the trigger I noticed that the sear would fail to engage reliably so I shelved it. There are 4 set screws to adjust trigger pull and over travel that are set with Loctite after adjustment so they’re stuck unless someone has suggestions… I would like to replace the trigger with something beefier and more confidence inspiring. The AA TRiggers are really nice but I would prefer something closer to Mil-spec.

In removing the grip screw I realized that I had used loc-tite on that too… Can probably apply some heat to loosen that up and replace the ergo with a MIAD.

My other big problem is that to remove the trigger I have to yank the safety which means removing the buffer tube and stop plate to get at the detent. I could reuse the castle nut and plate which have been staked but would prefer to replace them if they have to come off. I don’t see a way to get around the complete disassembly of the lower to do these things.

Any suggestions for these replacement parts or a new trigger group?

2

If you want a decent milspec type trigger look at the ALG defense QMS or ACT triggers. Or if you want an awesome 2 stage trigger go with a Geissele.

And you do not have to remove the castle nut and end plate to access your selector detent, that spring is retained in the grip.

3

Gieselle or KAC.

4

You could sell the AA trigger to pay for all the new parts you need. If you go Mil-spec. Is it this one?

5

Thats right! I was thinking the detent for the rear takedown pin. Brainfart!

I was thinking about the VLTOR A5 buffer tube, not sure it’d be worth it if I dont have to remove the old one.

The trigger I have is exactly like the one pictured. The 2 screws are set with loc-tite but I’m sure they can be heated and adjusted. I’m sure I can sell it for a good enough price to make it worth the hassle.

Thanks!

6

KAC triggers are known for being less than reliable. Geissele on the other hand has been proven to perform.

7

If it’s blue loctite you should have no problem breaking the screws loose with hand tools.

I rarely use any other loctite on firearms.

8

Red loc-tite. I’ll call this a lesson learned. Luckily I didn’t loc-tite the safety screw.

9

A soldering iron tip on the screws should heat them up enough to let you loosen them up.

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10

+2 on Geissele.

11

That’s odd. I’ve had great experience with mine, and have never heard of them breaking or anything…

12

“After installing the trigger I noticed that the sear would fail to engage reliably”

Do you mean the disconnector?

13

Very early ones had issues, they fixed the issues a long time ago though.

14

Red Loctite can be defeated with a “Wall paper removal heat gun” commonly found at Home Depot for about $30.

Good luck. Also, don’t put red loctite on guns anymore. :slight_smile: