What would cause the gun to click and dent primers? 300 Blackout AR 8.5" barrel with silencerco omega can shooting 220 gr subsonic hornady's.

Slamming the bolt, it's normal. Whats this click you speak of?

First thing to check is headspace. Then check firing pin protrusion.

Squeeze the trigger to fire and click. Doesn't fire. Pull bullet out and the primer is dented from firing pin.

What do you mean headspace and how do you check it? How do you check firing pin protrusion?

Well disregard what I posted then

bad ammo? have u tried others?

If you don't know what that means, then I would take it to a gunsmith to check. Not being condescending or a dick. Do you use that bolt carrier group in another upper and it work normally?

How big a dent? sounds like a light primer strike maybe your hammer spring is the culprit or installed backwards.

Well, I jumped in here and replied before reading ALL of the previous replies. I have nothing more to add ... carry on

Ive not really tried anything else. Seemed to be high quality ammo but who knows.

I would like to find a good gunsmith around here that could check it out. I don't use the bcg in any other gun. I never had this issue before I added the silencer though.

I believe it is a light primer strike. Seems to be anyway.

Take the hammer spring out and verify that it is installed correctly. They are really easy to get backwords and them still work, but be light. Adding a can won't effect it, but maybe switching to another ammo with a different primer caused it to show up.

Never an issue before adding the silencer hmmm. Have u checked to see if the bolt is closing all the way? Will the gun fire with suppressor removed? Have you broke it down & cleaned it since you have been shooting it suppressed?

If the silencer is causing a ftf, as in fail to fire, you have problems. Big problems.

That would be like you car engine shuting off when you adjust the rearview mirror.

Sounds like firing pin or spring. Try different ammo. And headspacing could be an issue as well. Is it reloads of factory ammo

Alright I took it apart last night and found a couple things. 1-The hammer spring is installed correctly. 2- There was a lot of what looked like to me, grains of gun powder inside the lower assembly where the trigger mechanism and all is. Definitely didn't look normal. I wiped it all down and cleaned it out as best I could.

The ammo was made by Silencerco and is called 'Harvester'. I was mistaken about the grain, as it is 208 grain Hornady A-Max. I'm pretty sure I didn't shoot it before I added the silencer because I didn't want to waste any rounds of subs. I haven't shot it since cleaning, but I'm guessing from your responses it could just be an ammo issue. Also makes me wonder a little more considering I don't think they are making this ammo anymore.

It could be ammo. But I'd get headspace checked out. Did you buy then gun new or second hand? Is it a factory gun or a home built? I think something else is going on.

I built it. Did a lot of research on what I was doing, but haven't ever built one before. PSA complete upper and I put the lower together with parts kit. All new parts.

Did the upper come with the bolt carrier group? Sorry to ask so many questions just trying to eliminate problems. I've bought a ton of stuff from them and never had an issue.

At the risk of being repetitive, double, triple, and quadruple check that the hammer spring is correct. Use multiple sources to confirm it. It is very easy to mess up.

After that, I'd call PSA and talk to them about it. If the BCG and upper came together I think a bad one slipped through their QC. Factory ammo should fire in these guns regardless of primers.