Under gassed!?!?!?

[Trevorvien71]

Ok here is the setup: AAC 12.5 upper with brakeout mount and AAC 762SD N6. Lower has standard buffer spring and H2 buffer as recommended by AAC.
Ammo used is factory 115 Remington super and 220 sub

115 super with suppressor the gun runs great, unsuppressed it will run but not lock back on last round
220 subs short strokes like crazy with suppressor. Did not bother trying subs unsuppressed, no point in it.

Suggestions? Comments? Go with an underpowered buffer spring? Change out buffer weight up or down? Thanks

[bani]

try PNW 220gr subsonics. bet you they work.

[Sdustin]

Write AAC i think there's something wrong if its not locking open with factory ammo id be disappointed to say the least I've never had a problem with my 9" AAC upper I've never run subs though since i have no can

[Maryland_Shooter]

Ok here is the setup: AAC 12.5 upper with brakeout mount and AAC 762SD N6. Lower has standard buffer spring and H2 buffer as recommended by AAC.
Ammo used is factory 115 Remington super and 220 sub

115 super with suppressor the gun runs great, unsuppressed it will run but not lock back on last round
220 subs short strokes like crazy with suppressor. Did not bother trying subs unsuppressed, no point in it.

Suggestions? Comments? Go with an underpowered buffer spring? Change out buffer weight up or down? Thanks

Back to AAC. For the price you paid, it needs to work.

[Sdustin]

Ok here is the setup: AAC 12.5 upper with brakeout mount and AAC 762SD N6. Lower has standard buffer spring and H2 buffer as recommended by AAC.
Ammo used is factory 115 Remington super and 220 sub

115 super with suppressor the gun runs great, unsuppressed it will run but not lock back on last round
220 subs short strokes like crazy with suppressor. Did not bother trying subs unsuppressed, no point in it.

Suggestions? Comments? Go with an underpowered buffer spring? Change out buffer weight up or down? Thanks

Back to AAC. For the price you paid, it needs to work.

+1 again

[300Blk]

As long as you don't have anything unusual, like an extra-power hammer spring, I would say call AAC and ask for an RMA number.