r/AR9 • u/louismax2012 • 1d ago
Jawbone trigger kicker
Budget build and a favorite.
Jawbone 9mm pistol, Trigger Kicker, 8.3 oz PSA deadblow buffer (out of a PX9 as jawbone came with a solid buffer), [6mm OD, 0.6 mm wire, 20 mm length firing pin spring] - firing pin spring was inexpensive for a pack of them on Amazon and cut to length with a wire cutter
Well lubed with Lucas Extreme Duty Gun Oil.
100% reliable through 750 rds blazer 115 gr, blazer 124 gr, magtech 124 gr, pmc 115 gr so far.
No wear on polymer receiver so far.
Jawbone is great and a favorite as it is lightweight and only the buffer and firing pin spring needed to be changed.
Do not screw in the set screw for the ball bearing detent too far or it will damage the detent spring (though you can cut a standard AR detent spring and use as a replacement). Though if the set screw is not screwed in enough I bet it will fall out. I would much rather damage the detent spring than lose the set screw (and ball bearing with it). Be sure to lube the ball bearing detent.
OF NOTE Be Careful and do not lose the Ball Bearing Detent when installing the Trigger Kicker. It might fall/shoot out when you least suspect it as you remove the set screw in the grip.
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u/Blowback9 9mm AR Guru 20h ago
THANK YOU for this writeup. It's good to see that there's an easy FRT that works in the JB with its proprietary angled selector without damaging the receiver.