Gas blow back with TBAC Ultra 7 or 9 on a precision semi-auto?

[oniak]

Curious if anyone has used there ultra 7 or 9 on a precision semi-auto. I used my TBAC cans on my bolt guns frequently, but not on any semi-autos yet. I like to keep gas blowback to a minimum, so have only been using my surefire cans on my semi-autos. I don’t plan on going ham with the Ultras on a semi-auto. Same rate of fire as with my bolt guns. Anyone have experience with this?

 

[Snuby642]

I put agb's on my semiautomatic 223, 300blk, 6.5g and it took care of overgassed and excessive blowback..

 

[Bryan W M]

I have an 6.5mm ultra 7 on my 5.56 with the gas block set correctly it’s great. I always have safetys on just in case.

 

[chadrp]

I'm using a U9 on my WOA 20" rifle length gas barrel with no noticeable blowback and no adj gas block. Only around 60rds thru it so far using IMI 69& 77 gr ammo. The 69gr chronos at 3000fps with a 2-230 ejection which would indicate being slightly over gassed. The 77gr chronos at 2850 with a 4 o'clock ejection.

I'm sure ymmv depending on caliber, gas system, ammo etc with so many variables in a gas gun platform.

 

[Snuby642]

Put an agb on them and enjoy.

 

[_Windrider_]

I use an ultra 7 with a superlative arms AGB. Love it.

 

[oniak]

Glad to hear these positive reports of TBAC Ultra use on semi autos. I want to run the Ultra 9 on a seekins semi auto, which does have an adjustable gas block. Thanks for to all the feedback.

 

[PDXGS]

Start with an adjustable gas bock- any idea what your barrel diameter is at the gas block shoulder?
The JP JPGS-6 systems are easy to adjust on the fly but fugly and bulky.
Wilson Combat makes a nice one too but they've been out of stock since forever

JP Rifles

Makers of the Finest Firearms Parts & Accessories | Wilson Combat

 

[TimK]

I must be the only one. I run an Ultra 5 on a couple .223's and a Valk. All run AGB's. The 14.5" .223 gasses me out pretty darn good.

 

[Snuby642]

I must be the only one. I run an Ultra 5 on a couple .223's and a Valk. All run AGB's. The 14.5" .223 gasses me out pretty darn good.

Are you using a standard spring and buffer?

I can't prove it or make justification but a H2 buffer and flatwire spring seen to help on my sbr's, 223 and 300blk.

Seems to be a popular set up that the hide suggested for me.

Edit: Both my sbr's are 10.5 so maybe a H1 for you ?

 

[tate1976]

I run one on my Wilson combat 6.5 creed. No issues just tuned the gas block