Hammer Won’t Release AR

[*bryce*]

I am installing a Geissele G2S in my Palmetto lower and using a Resurgent Arms extended safety selector.
Everything was working fine with my Milspec trigger but now that I have the Geissele installed, the hammer will not drop with the safety in either position.
By removing the grip and the safety, the hammer drops with no issue.


I dug up my old mil spec safety and it seems to work fine. Is this a common issue or is something out of spec here?

Update: Resurgent Arms Safety selector is 1mm too thick in the barrel.

[*bryce*]

Investigating some more and found my Resurgent Arms safety is 1mm thicker than my mil spec safety according to my calipers. Is this normal or an error with the resurgent arms safety?

[SkyHawk]

Or is the safety hole drilled too low on the lower? Or is the trigger tail too thick on the Geisele. Or are they all off by just a smidge? It may be tolerance stacking.

Anyhow, I would probably file the selector shelf or the trigger tail. Probably file the selector since it is the cheapest part.

[1snowridr]

I installed one of those and removed it shortly there after. I found it had over travel and I didn't like it. It did work tho. There's way better ambi's out there.

[*bryce*]

Or is the safety hole drilled too low on the lower? Or is the trigger tail too thick on the Geisele. Or are they all off by just a smidge? It may be tolerance stacking.

Anyhow, I would probably file the selector shelf or the trigger tail. Probably file the selector since it is the cheapest part.

[placerproud]

Palmetto State Armory lowers are somewhat notorious for being out of spec, I would look to that is the most likely issue. The safety selector could be the next problem and the Geissele trigger would likely be the last issue.

[*bryce*]

Palmetto State Armory lowers are somewhat notorious for being out of spec, I would look to that is the most likely issue. The safety selector could be the next problem and the Geissele trigger would likely be the last issue.

The problem is actually the safety I was using was 1mm too thick. I've actually never heard that of the PSA lowers.

[SkyHawk]

The Resurgent Arms safety measures 1mm thicker is diameter at the flat portion compared to the mil spec. I don’t think a low safety hole would be the factor although I’d be happy to measure mine.
The trigger could be too thick but I’d rather modify the cheapest part first if needed.

A low safety hole would give the exact same results as a too thick selector. In any case, it sounds like you found the problem and everything is working now with a new selector, and you did not have to modify anything? What was the final fix you settled on?

[caliguy93]

ok, lets just trouble shoot.. its really easy...

since the hammer drops with no issue with the grip and safety removed, have you tried it without just the grip. Meaning the safety is in place in the fire position, the grip is not installed, does the hammer drop without issue?

if so the problem is your grip screw being too long.

if not, then the issue is your safety.

[Sailormilan2]

I had a similar problem with a Palmetto P10 lower. Hammer wouldn't release. It turned out to be a large mold line on the hammer, which the trigger sear couldn't move past. A few minutes work with the hammer and some abrasive cloth on a flat surface fixed the problem.
An out of spec receiver might have contributed to the problem, but I have no way to see if the receiver is in spec or not.

[*bryce*]

A low safety hole would give the exact same results as a too thick selector. In any case, it sounds like you found the problem and everything is working now with a new selector, and you did not have to modify anything? What was the final fix you settled on?

I reached out to Will at Resurgent Arms and after a few messages back and forth he agreed to send me a barrel he believes will be in spec.

That was about a month ago, and I still haven't received it, unfortunately. So I am assuming he did not send it.

So I am beginning to assume my options are to use a dremel and remove 1mm of thickness from the safety selector barrel or order a new setup. I will probably just order a new setup as with a dremel and cutoff wheel I will never get a perfectly level surface and I don't really want that running in my gun.

[*bryce*]

ok, lets just trouble shoot.. its really easy...

since the hammer drops with no issue with the grip and safety removed, have you tried it without just the grip. Meaning the safety is in place in the fire position, the grip is not installed, does the hammer drop without issue?

if so the problem is your grip screw being too long.

if not, then the issue is your safety.

See post #2. It appears the safety I have it not within spec. It seems the cheapest part in the equation is causing the headache.

[ar15barrels]

I am installing a Geissele G2S in my Palmetto lower and using a Resurgent Arms extended safety selector.
Everything was working fine with my Milspec trigger but now that I have the Geissele installed, the hammer will not drop with the safety in either position.
By removing the grip and the safety, the hammer drops with no issue.


I dug up my old mil spec safety and it seems to work fine. Is this a common issue or is something out of spec here?

Is it the sear or the disconnector holding the hammer?
If it's the disconnector, verify it's not a problem of the grip screw holding the trigger.
If that's not it, your disconnector needs to be fitted to accommodate whatever mismatch you have going on.

If it's the trigger holding the hammer, you can fit the selector or the trigger.