[kfrancis2001]

I have a Century Arms 91 Sporter. The muzzle flash hider is seized up. I can't get it to move. It is a cross drilled, 12 hole muzzle flash hider. Any ideal how i can get it off.

[Eric F]

hack saw.............

no not really have a pic? If I can see it I can tell you. Is it welded on or threaded?

[kfrancis2001]

it appears to be threaded. but i dont have any pics

[rob b]

try some light heat and then oil ?
good luck

[kfrancis2001]

thanks

[Marlin 45 carbine]

heat it up and try it. if no go use PB blaster and heat until it smokes, then douse again and let it soak. may do the trick. hasn't failed me yet.

[TN Shooter]

I had the threaded gas adjustment plug on my Saiga Shotgun seize up on me. I used a liberal amount of Kroil and a good amount of soak time to free it up. After freeing it, I saw that it had totally rusted shut. Sold me on Kroil!

[BBBBill]

It is most likely either blind pinned, spot welded, or both in order to be legal. You will have to file the paint off the brake to find the pin.

[kingjoey]

It is most likely either blind pinned, spot welded, or both in order to be legal. You will have to file the paint off the brake to find the pin.

Yup, usually crosspinned on those rifles. I would recommend carefully cutting the brake in half with a Dremel

[Riss]

My Century 91 had a pin in the rear that was crushed in I think. FH was threaded on and a blind pin was crushed into a detent on the barrel. Had to cut the rear of the FH like a bannana and peel it off until I could get the entire thing to thread off. Talk about a PITA. Went and got a real FH from RTG parts later.

[Rail]

I have a follow-on question along these lines. I had a problem getting the remains of a break off of a Norinco m1a and I am concerned about how much heat it required to cut the weld. Now I am looking at heat treating the barrel end to be sure that it has the right hardness. Anyone have stats on the Rockwell scale needed on a barrel or barrel end? I am thinking it whould be around RC25 or a little higher and getting to that point and what to use for quenching is on my mind.

Anyone?

[radkoch]

A lot of times if they are "welded" they are actually silver soldered. Hopefully if you can concentrate the heat on the muzzle device you can minimize the annealling of the barrel.

I don't know if you want to spot heat treat the barrel as you will have to get it red hot and then quench but the 2 inch area next to what you just heat treated won't be and will more than likely be annealed or soft
.
To properly heat treat the whole barrel would have to be removed and heat treated and then normalized.
Others may have better advice but just my .02

[kfrancis2001]

We ground the paint off the flash hider but couldnt find a pin. Any other ideas? On how to get it off. We have heated it to cherry red and still couldnt move it.

[BBBBill]

Cut it off and square/recrown in a lathe. Years ago I made a mandrel to reach through the receiver and center on the chamber to drive an HK 91 we were shortening a bit. Not hard to do at all. You will probably need to do that anyway now that you got the barrel that hot.