[oldpapps]

What are you going to feed it?

[X-mark]

These came in a few days ago...AAC 16" 300 BLK upper with KAC URX II, AAC 51T Blackout, and Nickel Boron M16 Bolt Carrier.

[GREGULON]

Originally Posted by oldpapps

What are you going to feed it?

I am most likely not going to worry about suppression. My main reason for going Blackout is stopping power. So most likely a supersonic match hollow point.

[GREGULON]

Just ordered a H3 heavy buffer,spikes trigger guard, ambi safety, and Ergo grip. And I think that will take care of the details. The only other thing I might change the stock. The Vltor just seems unsecured compared to my CTR. I think either the ACS or the STR. Them its all upper.

[Alpha1Victor]

I'm currently building a .300 blackout sbr. I think its going to be kick ass.

[oldpapps]

Originally Posted by GREGULON

I am most likely not going to worry about suppression. My main reason for going Blackout is stopping power. So most likely a supersonic match hollow point.

I don't do suppressed or SBR.
This is what I have listed with a 16inch barrel:

Bullettype weight powder weight velocity
V-Max 110 H110 18.5 2160
V-Max 110 H110 19 2302
V-Max 110 H110 19.5 2271
V-Max 110 H110 20 2240
OTM 125 H110 16.5 2018
OTM 125 H110 17 2031
OTM 125 H110 17.5 2053
OTM 125 H110 17.8 2131
OTM 125 H110 18 2123
M2 GI 147 H110 16.4 1928
M2 GI 147 H110 16.6 1945
M2 GI 147 H110 16.8 1948
M2 GI 147 H110 17 1988

But alas, I am switching over to 'Lit Gun' and haven't done a test run-up yet.
As soon as I get a fully tested loading for the 147s, I will adjust that data for some 150 grain, expensive slugs for hunting uses.

This data is only for reference use and should not be used for direct loading use, as these loads may not be safe with other components, assembled in other manners, in other weapons.

[GREGULON]

So I just put some $ in the account and realized I could buy a new URX III 13.5 KAC rail for my 5.56 16" and switch the Ati rail to what will be 14.5" Blackout. I think the URXIII is so cool looking but is it really worth the $300. Can any one tell me why?

[X-mark]

Originally Posted by GREGULON

So I just put some $ in the account and realized I could buy a new URX III 13.5 KAC rail for my 5.56 16" and switch the Ati rail to what will be 14.5" Blackout. I think the URXIII is so cool looking but is it really worth the $300. Can any one tell me why?

that's just for the rail...you still need to spend $100+ for the proprietary tool. oh, forgot to mention...everything KAC is expensive.

[GREGULON]

So instead of the URX III I just purchased a Troy TRX Alpha 15" for $175. The only worry I have is that I like reconfiguring my rifle and the rail sections look difficult to swap out because they are connected with a back plate unlike the rail sections on my ATI rail which just screw on and off the outside of the hand guard. Any opinions or tip would be welcome.

[AgentTikki]

Admittedly it is a pain to get that rear section in place when relocating your rail sections.

Personally I think its a small price to pay, a trade-off for having a strong lightweight rail. Having threads built into the rail would be more convenient, but it would make the rail bulkier and heavier.