AR 9mm Reloading

[SecondsCount]

yours will still fire out of battery. ALL but the cmmg radial blowback will. Even the magwell conversions will. The problem is the hammer can still hit the firing pin with the bolt pulled back for about 1/2". It is not shrouded like a regular ar15 bcg is.

Are you running a mil-spec trigger?

 

[skeeljc]

I run 115 gr and 124 gr plated bullets at 900 fps for Steel Challenge in my PSA AR-9 (Colt pattern). So far the best trigger is a HyperFire.

 

[tommeboy]

It has never happened to me... and I couldn't make it happen, when I tried, as explained...it will not happen with the extractor not engaged in my rifle, as it would be until chambering. You can look at the video of the full auto 8000 rd torture test had no problem...in full auto. I have had no problem in many thousands of rounds...littery a bucket of brass...some fired at very high speed and hot chamber and barrel...no problem in different guns. But you seem to have a problem, sorry about your situation... but you sound like a product salesman. If I run into a problem in the next 100,000 rds and can not figure out the solution I might give the radial bolt barrel combo a try..but for me it's a solution not needed, at this time, and I've heard of problems with that set up...which steered it away from me in the first place...don't remember exactly what it was...feeding comes to mind. I have no problems .. no need to change anything. The 9MM is very reliable, fun, accurate, and big increase in power...when combined with the AR platform. No need for change when it's hitting every note, like a fine instrument.

There is a difference in how the triggers work in a FA. The hammer cant release till the bolt is closed and then the sear trips. That is why it will not do it in a FA. What happens in a semi is you can out run the bolt cycle speed and pull the trigger before the bolt is all the way closed. It also happens when you have bolt bounce. The bolt slams up against the barrel and bounces back extracting the round a little and the hammer strikes when the bolt is back off the face of the barrel. This is the likely culprit in most out of battery discharges.

All you have to do is do a search on ar9 firing out of battery. It has been a thing with ALL blow back designs since the first one was made.

I am done with this as you don't know what you are talking about

 

[sksshooter]

There is a difference in how the triggers work in a FA. The hammer cant release till the bolt is closed and then the sear trips. That is why it will not do it in a FA. What happens in a semi is you can out run the bolt cycle speed and pull the trigger before the bolt is all the way closed. It also happens when you have bolt bounce. The bolt slams up against the barrel and bounces back extracting the round a little and the hammer strikes when the bolt is back off the face of the barrel. This is the likely culprit in most out of battery discharges.

All you have to do is do a search on ar9 firing out of battery. It has been a thing with ALL blow back designs since the first one was made.

I am done with this as you don't know what you are talking about

I did do a quick google search and the first 5 posts i read all attributed the concern you speak of to bolt bounce due to incorrect buffer weight. None pointed at 115g bullets as the issue. So while it could be an issue as you describe its not necessarily due to bullet wright which was my initail assumtion when you started. Like any firearm that you modify there is always a need to make sure it functions properky. The ar platform was designed to shoot 223 so when converting to a diff cal it should be assumed that you have to match all of the pieces to work..

 

[Ray123]

There is a difference in how the triggers work in a FA. The hammer cant release till the bolt is closed and then the sear trips. That is why it will not do it in a FA. What happens in a semi is you can out run the bolt cycle speed and pull the trigger before the bolt is all the way closed. It also happens when you have bolt bounce. The bolt slams up against the barrel and bounces back extracting the round a little and the hammer strikes when the bolt is back off the face of the barrel. This is the likely culprit in most out of battery discharges.

All you have to do is do a search on ar9 firing out of battery. It has been a thing with ALL blow back designs since the first one was made.

I am done with this as you don't know what you are talking about

It didn't happen at full auto torture test for over 8000 rds with this set up..You'll have to agree full auto 9mm is very fast....and there is bolt bounce in full auto too. No problem...
What about all those open bolt sub machineguns... The UZI made in 1950 comes to mind... open bolt with straight blow back design ...1200 to 1500 rds per minute. Same principle....used in all major wars since its introduction, from, before Vietnam to past the Syrian war...standing guard duty all over Israel..I've seen pregnant women guarding grade schools with the 9 mm Uzi on their shoulders, against the terrorist. Over 10 million made...billions if rds fired. So you'd have to agree this system works pretty well...and mine works very well too...no reason to change, "it ain't broke", so "no fix" is needed ...
And I just ordered another new AR 9mm barrel...be here in a week...same setup...it just plain works...with mixed range brass by the thousands loaded in a Dillon progressive with 50 to 185 gr bullets, being utilized, 2500 fps to 900 fps...it all functions, with this set up...

 

[eyeman56]

Yes. I prefer 124 gain bullets in my loads. Some pistols run better and are more accurate with the heavier bullet.

Do you change the load when shooting 124g vs. 115 grain bullets?

 

[SecondsCount]

Do you change the load when shooting 124g vs. 115 grain bullets?

Yes. I typically run a little faster powder with the 124, WSF or VihtaVuori N320 are my preferred powder for the 124 load.

 

[nakneker]

I reload for my AR 9mm. I’ve been having great results with 147s and N330, 2 different round nose bullets and XTPs.

 

[padom]

I've been loading for 2 AR9's and an MP5 for a long time.. I shoot them all suppressed 100% of the time and feed them 165gr Xtreme's and 147gr Xtreme subs over N340.. stupid quite and extremely accurate...and those 165gr hit steel like a freight train..

 

[Scott-ak]

Anyone here reload for either AR 9mm pistol or rifle?

yes

 

[Rsadams]

My friend trains for a state prison and local PD and he was telling me they were feeding MP5s a +p+ which was to much for sidearms really but worked well in sub machine guns and had plenty of power of course.... That being said I don't think loading that hot would necessarily be a good thing and wouldn't do it... Their stuff was factory loaded rounds and I doubt they care about any kind of longevity since they don't shoot them alot and are replaced by tax dollars....

 

[GuitarmanNick]

I had issues early on with bolt bounce in my 10.5" AR-9 pistol build. Finally got the right buffer and spring combination to resolve the problem.
I load 124 grain JHPs that reach ~1350 FPS with excellent accuracy at 100 yards. Love the 10.5" barrel for that reason.