300BlkTalk

You will need a larger gas port or lighter buffer with the mini silencer.

yondering wrote:

Dolomite_Supafly wrote:It's safe to say the 6.5" barrel the OP has is not going to cycle subsonics without a load that produces high muzzle pressure, because the gas port is so close to the muzzle.

This. You need a shorter gas system or ammo that makes more pressure as the gas port.

The larger bore size and small charge of faster burning powder of the 300 BLK means there is less pressure at the gas port that there would be for a 5.56. There is not enough pressure at mid length to cycle the action, so the larger bore on 300 BLK is doing the same thing the longer gas system does ...

Dolomite_Supafly wrote:Everything was correct except his gun would not cycle any subs, including the factory recipe in the AAC website. It was well lubed and cycled supers perfectly.

There is some mechanical problem that is causing just enough drag or gas loss to make subs not function.

...as long as it does not obstruct the gas due to its internal design. Or leak gas... But there is really no benefit on a 16" carbine gas. Check gas block to port alignment. Most gas blocks have the wrong gas port offset, they need to be spaced of the shoulder of the barrel like there is a han...

There is no reason to think that with a subsonic round like this it wouldn't be the perfect match for an SBR home defense weapon. Gel testing links? Expansion through clothing? Max penetration? Factor in increased follow up shot speed due to lower recoil and transfer of kinetic energy from a heavie...

We have 16" rifles and complete uppers available with our hammer forged chrome lined 300 BLK barrel. Basic model with fixed front sight and M4 type handguard http://noveskerifleworks.com/imimg/lrb-300blk_1d.jpg NSR model with 13.5" NSR handguard http://noveskerifleworks.com/imimg/lr-300blk...

I could not feel a difference of blast between the 8 to 10 inch.

While I expect to eventually see an expanding subsonic it's not what I would use for defence. Subsonic to me is just a bunch of fun, I'll stick with the better performing supersonic for everything else.

I will tailor one subsonic load for the weapon. Are you aware of how much terminal performance you loose with subsonic? Penetration is excessive as well. You could just start with an 8" barrel and pick between the shortest or quietest silencer, probably thread on for this application. Integral...

Check gas tube alignment/inspect for worn gas tube.
Try a known good carrier.
Stick with 1680.