[Federal 115gr ammo and Hiperfire Eclipse - Are Pierced Primers a Critical Concern?]

Check your firing pin for a damaged tip and try a different one. the Iron city titanium firing pin may be a good one to try. 

[Firing Pin Compilation]

Rounding the strike end of the firing pin may be help full. I noticed some firing pins are rounded a bit to start with. I believe finding the right combination of bolt, firing pin and trigger group may have effect on how well the firing pin holds up. The firing pin being struck squarely I believe would drive it straight to the primer with out banging it around in the firing pin channel. AR-15 firing pins are rounded on the strike end and are nearly resting on the primer with the bolt closed so when the hammer strikes there's very little travel. Unlike 9mm firing pins that work by inertia and have a ways to travel before striking the primer.

[Firing Pin Compilation]

The length is overall length form tip to head. With the way these bolts slam the titanium being much lighter than steel may not jostle around as much reducing some of the stress. 

 

[Firing Pin Compilation]

I compared all my firing pins to see where they are different. The one on left is the pin that came in my Faxon bolt that the tip got damaged and started piercing primers. I was able to reshape it a bit with a stone. Better but not fixed. Next is the CMMG I've been running with no problems. The next one is a Wilson I fired a few rounds with to make sure it worked. Last is the ICRW that I ran 100 rounds so far with no problem. 

I did some measurements and found the tips to be mostly the same .065" The length was the same with the Faxon and Wilson 2.642" The CMMG 2.650" and the ICRW being the longest at 2.671" .029" longer than the shortest but works in my bolt. I'm going to run the ICRW pin. The Wilson and the CMMG are identical except for the .009" difference in length.

[Let’s see your PCC blaster]

18 hours ago, Bdh821 said:

I’ll sell you one that was supposed to be on my build...  but I’ve shot his primary gun obviously. It’s a great setup. I’d def consider switching from a MPX if I wasn’t so deep into MPX world. Less s#!t to clean... less moving parts. 

Shoot me a PM.

[Let’s see your PCC blaster]

4 hours ago, mellino19 said:

Both of my PCCs are franken-builds my original primary has become my back up - luckily I've tuned them so both run damn near identical given the different barrel lengths. Ideally a backup will match the primary but oh well.

 

Current Primary PCC:
Gibbz ambi lower (thanks to @Bdh821 bailing on his brekke build )

Brekke 10.5" Max Leograndis barrel with compXtension and smoke composites handguard combo setup
ICRW Mohawk 3.0 Copperhead bolt
Blitzkrieg 5020SS buffer with a 308 orange sprinco buffer spring in an A5 tube

CMC 3.5lb PCC trigger

Holosun 510c

 

 

Backup/original PCC prior to Brekke build:

 

New Frontier C9 Lower with a Titan Rocket Industries magwell

16" JP stainless barrel and JP stainless bolt with Venom Defense 9MM comp and a taccom feed ramp
Iron City Rifle Works Berserker 13" handguard

Holosun 510c (and a now removed Burris FastFire III offset)

Blitzkrieg 5015HD buffer with weight spacer and JP rifle length 308 spring

CMC 3.5lb PCC trigger

 

 

 

 

Nice! How do you like your Mohawk red Bolts? They seem to be some of the best.

[Larue MBT-2S in a GMR-15]

I tried the MBT in my AR9 running the latest Faxon bolt and the hammer would follow quite often. I'm now running the CMC ar9 trigger with no problems. 

[Let’s see your PCC blaster]

Spikes Glock upper and lower. Faxon 14.5" barrel and BCG.  CMMG firing pin. CMC trigger with KNS non rotating pins.  Blitzkrieg hydraulic buffer system.  BCM handguard. 

6.25 lbs. with sight installed. 

[Trigger reset issue, too light a load or too heavy a finger?]

What could be happening the trigger is not fully at the rear due to recoil backing the trigger from your finger when the bolt is cocking the hammer causing the hammer to fallow. If the trigger is not fully pulled at the time the bolt ramp depresses the hammer the latch doesn't catch it. 

 

[Nitride finish on the inside of the barrel]

I have the 14.5" Faxon with machined flash hider. This is a very accurate barrel with 147gr ammo and has no muzzle jump. The chamber looks like the nitride was cleaned up. 

[Rifle length buffer tube and blitzkrieg ??]

I'm running Blitzkrieg's high dampened kit in a carbine buffer tube with a 14.5" barrel. The orange .308 carbine spring is quite stiff when compressed and you can feel when you start to compress the buffer at the end of the stroke. This dampens the shock of the bcg / buffer group contacting the end of the buffer tube quite well over the solid 7.5 oz buffer. I shoot full power factory loads . Mostly The cheapest brass case 115gr but my gun is most accurate with 147gr . The 147gr. shoots quite soft with little bounce.

 

 

[Why 40+ round mags?]

Gunmagwarehouse has all the ETS mags and the 40 round may be on sale. I found the 40 round to easy to load 40 rounds and seat on a closed bolt. 

 

[CMC launches new 9mm PCC trigger]

I've been running the CMC 9mm trigger in my build for about 200-250 rds. I just checked the pull with my RCBS gage @ 3.25 lbs. Over travel is near nothing with a short but tactical reset. So far I'm not seeing any unusual wear from using this trigger. I'm holding the trigger group in with KNS non rotating pins. 

[Help Needed: AR9 - Sparks Coming From Ejection Port]

Auto .22 rimfire does the same thing. Just not as much.

 

[What is your carry gun and why?]

I mostly carry appendix 43x in the light tuck. In cooler weather 19x. 

[Any tips on getting an old crush washer off?]

grease the threads and use vice grips to back the washer off.

 

[Ball powder for 77 gr 223?]

I get great velocity and accuracy using CFE223 behind 55-60gr bullets. With 77gr SMK CFE223 gave good velocity but couldn't find the accuracy that Varget gave. I single load 77 SMKs with Varget using the Charge master  lite.

ARBilly

[Howdy from the steamy south]

I first came here for the great information to learn what to build my first AR9. I've built a few AR15s but the AR9 is a different animal. Well I was successful thanks to this forum. Maybe I can make a contribution that will be helpful.

ARBilly