The saga continues at this post: #59
Skip to : #73 for the list of approved triggers from Aero
Success Using TTech Trigger. Skip to : #80 to see how TTech, RA, and Timney compare.
Final Build Success: TriggerTech AR-9, FailZero BCG, Kaw Valley Precision 10oz Buffer (for a total reciprocal mass of 23.9oz), and Sprinco Orange (highest power in the lineup) Buffer Spring. Weapon cycles beautifully now and has retained bolt hold open.
Original post starter below:
I took my AR9 (Aero EPC-9) to the range this morning for its first test shots. It did not go well.
About the build:
- Aero upper, lower, bcg, barre, hand guard, charging handle
- geissele 3-gun trigger
First sign of not good: had what seemed like automatic fire. But I'm not 100% that the rifle just didn't bump fire against my finger - the trigger is silly light (that's another thing to rectify for me).
In attempting to rule out disconnect/reset issues, I made sure to hold the trigger down hard on the next shot. Next shot was fine, with the exception that the trigger never reset…I think the hammer just followed the bolt home.
Interesting. So I load 1 more - last round in the mag and boom she goes - magazine ejected to the floor and this little diddy in the chamber:
There appears to be no damage to the barrel or bolt, firing pin, or extractor. Ejector, mag catch…everything looks good. Even the magazine seems to have come out alright.
So what are my possible causes for this?
Ammo was factory new CCI Blazer.
Skip to : #73 for the list of approved triggers from Aero
Success Using TTech Trigger. Skip to : #80 to see how TTech, RA, and Timney compare.
Final Build Success: TriggerTech AR-9, FailZero BCG, Kaw Valley Precision 10oz Buffer (for a total reciprocal mass of 23.9oz), and Sprinco Orange (highest power in the lineup) Buffer Spring. Weapon cycles beautifully now and has retained bolt hold open.
Original post starter below:
I took my AR9 (Aero EPC-9) to the range this morning for its first test shots. It did not go well.
About the build:
- Aero upper, lower, bcg, barre, hand guard, charging handle
- geissele 3-gun trigger
First sign of not good: had what seemed like automatic fire. But I'm not 100% that the rifle just didn't bump fire against my finger - the trigger is silly light (that's another thing to rectify for me).
In attempting to rule out disconnect/reset issues, I made sure to hold the trigger down hard on the next shot. Next shot was fine, with the exception that the trigger never reset…I think the hammer just followed the bolt home.
Interesting. So I load 1 more - last round in the mag and boom she goes - magazine ejected to the floor and this little diddy in the chamber:
There appears to be no damage to the barrel or bolt, firing pin, or extractor. Ejector, mag catch…everything looks good. Even the magazine seems to have come out alright.
So what are my possible causes for this?
Ammo was factory new CCI Blazer.
Last Edited:
, but isn't this possible issue with 9mm pcc's the reason they started making specific trigger groups for them?
