Hoffman safety in a 9mm Colt AR?

[ferndog1]

Just installed a Hoffman Super Safety in a Colt semi-auto 9mm AR15. It won't fire in any mode because the bolt carrier won't completely close. If I take the Hoffman safety out it closes.

Any ideas?

 

[ericthered]

You didnt grind the trigger enough. The bevel on the back of the trigger is what it is hanging up on. When you grind more it will start to only close in standard semi mode. then grind more until the bolt closes normally and dry functions fine with no stickiness in the bolt travel.
9mm will need sliding weight buffers. Or you will have out of battery discharge.

 

[ferndog1]

The problem is the weight in the rear of the bolt is curved, not flat and the lever on the Hoffman device is catching on it.

 

[hkg3k]

Forgo filing, grinding or milling on your 9mm bolt weight and just replace it with one of these - 9mm CARRIER WEIGHT EXTRA HEAVY

It's completely flush with the rear of the carrier channel, adds weight and completely clears the SS lever. Works perfectly in my 9mm setup.

Good luck

 

[ferndog1]

THANK YOU!!
That looks like the solution to the problem.

 

[Haris1]

HKG3K IS CORRECT
you dont want the weight going forward inside the carrier
so that it sticks out on the muzzle end
you want to maintain the m16 bolt profile or else the lever will drag or break

 

[captshiess]

Forgo filing, grinding or milling on your 9mm bolt weight and just replace it with one of these - 9mm CARRIER WEIGHT EXTRA HEAVY

It's completely flush with the rear of the carrier channel, adds weight and completely clears the SS lever. Works perfectly in my 9mm setup.

Good luck

Older thread but I’m just attempting to get my old colt 9mm running with a ss. I ordered the weight for my bolt. Should I also get a heavier buffer (8oz)? Did you get yours going with just the replacement bolt weight?

Thanks!

 

[ericthered]

Older thread but I’m just attempting to get my old colt 9mm running with a ss. I ordered the weight for my bolt. Should I also get a heavier buffer (8oz)? Did you get yours going with just the replacement bolt weight?

Thanks!

8 oz works good. I have been running the cozad buffer with a 308 spring. It is a lot smoother then the standard buffers. Rpm on a 5" is 1000

M18K Pistol Caliber Carbine Buffer 6.2oz | Cozad Manufacturing

Drop in replacement for your ar15/m4 pistol caliber carbine. Absorbs recoil Creates faster follow up shots Reduce rate of fire in automatics Made from heat treated 17-4 stainless steel Improves accuaracy in rapid fire Reduce shock to optics or other mounted accessories Extended length for use in...

www.cozadmanufacturingllc.com

 

[hkg3k]

Should I also get a heavier buffer (8oz)?

That's something you can experiment with... but a standard 2-piece 9mm buffer should work fine as well.

Did you get yours going with just the replacement bolt weight?

I use the same buffer setup as I had before...which is one of those hydraulic buffers which is longer and "stroked" specifically for pistol calibers. Works the same for me whether it's set up with a SS or RDIAS.

Good luck

 

[captshiess]

good info! I ordered the weight and 8oz buffer. That’ll put me right at 25oz for the bolt/buffer. I hear 23oz is the mark that people seem to have the most success. I thought about a hydraulic buffer, but I’ll see if this works. Thanks for the input!

 

[root]

Thanks for the info everyone.
Kinda want to put one in my Colt carbine and looking at the bolt I figured it wouldn't work.

Solved my problem without even asking !