Intro

[JimF4M1s (Deceased)]

Keep us informed of your progress.

[CrossedCannons]

Congrats. Mine took about the same length of time a few years ago when everyone elses was taking 6 months.

Are you a leftie? I was trying to understand the physical basis for the M2's marked tendancy of the muzzle to rise toward my right. I'm right handed and thought ejection of the brass might be pivoting the rear of the gun about its center, but somebody who shoots left handed told me his rise is toward his left. So it seems to result from the way the carbine is supported, but I'd appreciate it if you could weigh in when you get the chance.

[3154tm]

it may take awhile, it's been so long i'll have to bring myself back up to speed. should be interesting.
crossedcannons, i'm a righty. my only experience is with my MAC's and they mostly go straight up.
i wonder if a compensator on the M2 would make a difference. the stock version looks like it could be rotated for the desired effect. i think i'll start looking for one.

[tenOC]

I think you made the right decision on getting a trigger pack instead of a receiver...for a shooter. Someone said it's hard to damage a receiver, but they're actually easy to damage. When you fire full auto everything in the moving assembly is stressed. If one of these 70 yr old rifles is a little loose in spec the bolt can crack the lug and go off the rails causing damage to the receiver. I've handled a Carbine that was damaged in that way and most likely from full auto. It had full auto parts in it when the owner bought it. It still had the broken bolt in it. A new bolt wouldn't go back in until the burr was filed off and an amount of metal was found impacted and deposited at the burr I'm speaking of so that the thin left lug wasn't in full contact of the now damaged rail. It plowed the metal a bit. You'd never be able to fire that one full auto again, and that's a loss of investment. Fixing it is an option, but fixing the register part of an M2 is easier, cheaper and safer.

[Bruce McAskill]

The direction of the rifling twist is what will determine which way a full auto will rise. If it's goes to the right it's a right hand twist for the rifling.

[CrossedCannons]

The direction of the rifling twist is what will determine which way a full auto will rise. If it's goes to the right it's a right hand twist for the rifling.

Huh? I expect that conservation of momentum means that the increase in the bullet's angular momentum as it accelerates through the bore's rifling would result in an angular momentum of the bore counter to that of the bullet. So the barrel would tend to rotate about it's axis. How would such rotation change the bullet's point of impact?

[emmagee1917]

A bullet fired in a right hand twist barrel will drift to the right due to the spin of the bullet. This is why the old 1903 Springfield sight ladders went further left as you raised the crosspiece . You would aim off to the left to cancel the drift to the right . Most modern guns have sights that stop so close that the drift is ignored .
Chris

[CrossedCannons]

Spin drift of several inches noticible at 25 yards?

[emmagee1917]

No , 1000 yards , yes.
Chris

[3154tm]

well, i'm ready to dive into the conversion from M1 to M2. i think i have all the parts and since i have to swap out the current flat bolt for a round bolt i'll need invest in a bolt disassembly tool and head space gauges. could someone suggest the best place to buy the clymer gauges and bolt tool, the prices seem to vary wildly.
i'm still looking for a commercial carbine to convert but in the mean time i thought i'd get my inland up and running just for s*#*s and giggles.
thanks