M&P 45 TB problems

[Buckeye76]

I bought a threaded barrel awhile back for my M&P 45 full size. I just got around to swapping my barrels and found that it gets stuck when I try and rack the slide.

It's a s&w barrel. I figured it wouldn't need any work. I can't tell exactly where it is binding, but it looks like it happens at the muzzle end and not inside the slide.

Anyone have any experience with this?

 

[gamadmex4502]

No, but I thought about doing this. In fact I just got a Sig .357 barrel for one of my M&P's made by S&W. Hopefully, that won't pose any problems.

I would contact S&W Customer Service. They're pretty fast to respond in my experience.

 

[DanKATL]

I bought a threaded barrel awhile back for my M&P 45 full size. I just got around to swapping my barrels and found that it gets stuck when I try and rack the slide.

It's a s&w barrel. I figured it wouldn't need any work. I can't tell exactly where it is binding, but it looks like it happens at the muzzle end and not inside the slide.

Anyone have any experience with this?

Take the slide off and run it through manually, does it do the same thing? How does the profile of each compare side by side?

 

[harrycalahan]

How stuck? Ive had some stiff barrels that just needed running to lap them in. If it locks into battery, Id lube everything up good, including the barrel OD and run a box of ammo through it.

 

[geezer]

Take the slide off and run it through manually, does it do the same thing? How does the profile of each compare side by side?

Very good reply.

 

[Buckeye76]

Take the slide off and run it through manually, does it do the same thing? How does the profile of each compare side by side?

I did try this. Once you start pushing the barrel forward, it binds after it moves about a half an inch. I ran the barrel through from the muzzle end and it fits through the hole. I also stuck it in backwards to check the fit in the slide and that seems fine. I think it's more of a cant problem?

 

[Buckeye76]

How stuck? Ive had some stiff barrels that just needed running to lap them in. If it locks into battery, Id lube everything up good, including the barrel OD and run a box of ammo through it.

Stuck enough that I can't push it forward. I haven't tried forcing it with a mallet or anything yet.

 

[DanKATL]

I did try this. Once you start pushing the barrel forward, it binds after it moves about a half an inch. I ran the barrel through from the muzzle end and it fits through the hole. I also stuck it in backwards to check the fit in the slide and that seems fine. I think it's more of a cant problem?

How about a pic of the barrels side by side?

 

[harrycalahan]

Stuck enough that I can't push it forward. I haven't tried forcing it with a mallet or anything yet.

Sounds like they didnt mill enough off the top lug of the chamber and its catching inside the slide. Grab a set of calipers and compare sizes between the barrels.

 

[Buckeye76]