AR 9 pistol light strikes, sporadic

[LonewolfMcquade]

9mm AR's are known for beating triggers to death.

Thank you, I did not know that! Nice rig!

 

[LonewolfMcquade]

I wanted to add an mlok rail to mine. Turned out a little troublesome being the muzzle device took up most of the space within the hand guard. So i made a little modification to the muzzle device.

 

[Dusty Stevens]

9mm AR's are known for beating triggers to death. There are not many triggers that will survive long term in a 9mm AR. HyperFire is one that does.

I shoot Steel Challenge with my AR-9. I run 124 grain Berry's plated bullets at 980 fps out of a 16" barrel. Some guys slow them down more than that. Factory 9mm ammo will come out of a 16" barrel at 1200 fps to 1400 fps.

How sturdy is that handguard? I been wanting one just like it but not sure of the flex at the end

 

[skeeljc]

How sturdy is that handguard? I been wanting one just like it but not sure of the flex at the end

Actually it is just as solid as an aluminum one. It comes with its own barrel nut. The carbon fiber tube is a tight fit on the barrel nut and it is secured with a single screw.

 

[GuitarmanNick]

After experiencing an OOB detonation last Saturday in my 10.5" pistol, I thought it might be prudent to mention that buffer selection in a pistol caliber AR is critical to insure safety.
The lower was a Polymer80 that had been gifted to me and it did not survive the incident. The magazine well was split apart along with the Pmag body housing an Endomag insert. The insert was okay and is already in another mag body waiting for a new aluminum lower to be assembled.
The upper assembly, bolt and internal lower parts were undamaged.
My research indicates that an aluminum lower would have sustained no significant damage and I would likely have been able to continue shooting. Not sure anything would have saved the magazine body.
I was using a 5.3 ounce buffer with a .308 carbine spring as recommended by the manufacturer for the 10.5" barrel and had fired around 300 rounds without incident. I decided to increase the rate of fire on my last magazine which was around one round per second because I was still acquiring the target @ 25 yards(indoor range) with iron sights before firing. About 5 rounds in, kaboom!
Luckily, nobody was injured but some debris did hit me in the right hand and face. Smoke poured from the gun including the end of the buffer tube which really got my attention.
After getting home, research led me to more information that I should have found before doing the build about the possibility of an OOB detonation. Since the bolt does not lock up on a blow back system like on a rifle caliber, and the hammer is not blocked, it is possible that an increased rate of fire will result in an OOB firing. A 9mm bolt also needs to be checked for over travel and an appropriate spacer used if needed.
In order to avoid this again, my intention is to use a Foxtrot Mike 6.4 ounce extended buffer in the reconstruction. I will also double check the bolt travel(something I did not do on the first assembly). I am also considering a stiffer buffer spring.
To summarize, be careful when selecting components to insure your performance expectations are met. Some may not be up to the intended purpose(polymer AR lowers).

 

[skeeljc]

After experiencing an OOB detonation last Saturday in my 10.5" pistol, I thought it might be prudent to mention that buffer selection in a pistol caliber AR is critical to insure safety.
The lower was a Polymer80 that had been gifted to me and it did not survive the incident. The magazine well was split apart along with the Pmag body housing an Endomag insert. The insert was okay and is already in another mag body waiting for a new aluminum lower to be assembled.
The upper assembly, bolt and internal lower parts were undamaged.
My research indicates that an aluminum lower would have sustained no significant damage and I would likely have been able to continue shooting. Not sure anything would have saved the magazine body.
I was using a 5.3 ounce buffer with a .308 carbine spring as recommended by the manufacturer for the 10.5" barrel and had fired around 300 rounds without incident. I decided to increase the rate of fire on my last magazine which was around one round per second because I was still acquiring the target @ 25 yards(indoor range) with iron sights before firing. About 5 rounds in, kaboom!
Luckily, nobody was injured but some debris did hit me in the right hand and face. Smoke poured from the gun including the end of the buffer tube which really got my attention.
After getting home, research led me to more information that I should have found before doing the build about the possibility of an OOB detonation. Since the bolt does not lock up on a blow back system like on a rifle caliber, and the hammer is not blocked, it is possible that an increased rate of fire will result in an OOB firing. A 9mm bolt also needs to be checked for over travel and an appropriate spacer used if needed.
In order to avoid this again, my intention is to use a Foxtrot Mike 6.4 ounce extended buffer in the reconstruction. I will also double check the bolt travel(something I did not do on the first assembly). I am also considering a stiffer buffer spring.
To summarize, be careful when selecting components to insure your performance expectations are met. Some may not be up to the intended purpose(polymer AR lowers).

I assume it was a factory round?

 

[GuitarmanNick]

I assume it was a factory round?

Yes. 124 grain Aguila. Not the best, but not the worst either.