Sig Mauser M2 .45 Function Issues

If you have one of these guns and need some advice on how to make it cycle reliably, I have done so with mine. Curing the glitches that made this gun only last one or two years of production. Just not enough fine tuning and attention to detail, before they let them out on the market. As they were, you couldn't trust them. When working properly they are superbly accurate and reliable. Nothing a man can't fix with simple home tools. But you must have the ability to dismantle the striker assembly from the slide and not lose the tiny parts, especially the really small rebound sleeve cross pin. Lose anything and you may not be able to get a replacement. If anyone has this gun and feels capable, I will walk you through it.

The rotating barrel locking system lets the barrel rotate in place, always with the same axis in relation to the sights, since it does not tilt. This prevents vertical stringing from a slightly different lockup each round. This gun puts em right where the sights were looking when the gun went bang. Every time.

Let me know if I can help.

I won a Mauser M2 at a Friends of the NRA banquet several years ago. After a few hundred rounds I began getting "light strikes" on primers. (clearly dimpled primer but no BANG) At first this only occured with CCI ammo. A few hundred rounds later it began to happen with Winchester white box too. I took it to a local gunsmith who kept it for a month or more and said he'd never seen anything like it. "Couldn't fing a hammer spring for it in any of my catalogues." I brought the owner's manual to him and asked what spring(s) needed to be replaced. He suggested two but had contacted Sig and was told that they had no replacement parts for the M-2 and didn't know where any could be found. (He gave me the print out of the message from Sig) I got the two springs from Numrich and had a retired NYSDOC armorer install them. He tested the pistol with Magtech ammo and experienced no problems. A few weeks later, I took the M-2 to the range, loaded it with Winchester White box and it went BANG, BANG, click. Racked the slide, click. Racked the slide, click. I took the "duds", loaded them into my Llama Max I and they all preformed flawlessly. Any suggestions?

I honestly don't know anything about the pistol and wouldn't speculate for fear that you would know how very little I know. I do know that I would look here if it were me: http://sigforum.com/eve?a=cfrm&s=674608412

Kayen,
The striker or firing pin on the M2 moves through a spring loaded rebound sleeve. On mine, the sleeve was too tight and had a bur on one end, also it was too long and did not allow deep enough indentation of all primers. Be very careful here in disassembling to the firing pin, the main striker spring is very stiff and loves to fly across the room, then the firing pin sleeve has a cross pin and it is asy to lose and hard to get to fit back cross ways again to guide the sleeve.
If your sleeve is binding like mine was, first use a sharpening stone and remove .5mm from each end of sleeve, then use a needle file to remove burrs and the crimp that seemed to be inside one end of my sleeve. Rest assured the main striker spring is plenty heavy enough, once this binding is dealt with.

If you have failure to go into full battery (lockup) that is another problem. The striker main spring pushes in opposition to the recoil spring while the striker moves to halfcock ready position as the slide closes the last inch. Try this. Fully loaded, safety on, poin the gun straight up, and pull the slide down about 1/8th to 1/4". If it stays there, you will have to remove 3/8" to 1/2" off the main striker spring.

These two fixes restored my M2 to full functional reliability and it is phenomenally accurate. And no more click misfires.

Sorry it took so long to respond but unemployment and lack of appropriate tools made "giving it a try" impossible. (Had the time but not the resources.) New job and a little disposable income made needle files and stones obtainable. Followed your (excellent & clear) instructions carefully and finally got a chance to get to the range yetsreday to see if the weapon was cured. It went bang every time. Even with CCI Blazers that never worked before. Thanks for your help, it is greatly appreciated.

I am glad someone was helped by my experience. I wouldn't trade my M2 for anything else now. I have never fired a more accurate semi auto. Kayen, thank you for posting your results.
Joe B.