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Posted: 12/12/2011 3:52:37 PM EDT
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Got to the range a few weeks ago with my M2 tactical to test its most recent configuration. I wanted to see if reliability was hindered by the accessories I have on the weapon with the standard defensive loadings I run in the weapon.
Since the last time I had shot the m2, I installed a mesa urbino, added a tlr3, and exchanged a dmw bolt handle for the much lighter benelli round handle, then relubed with slip 2000. I have an 8 round side saddle and a dmw mag extension on the gun as well. Ran about 450 rounds of remington and winchester 9 pellet 00 buck through on this range trip and had no failures-besides benelli thumbing the hell out of myself  I ran about 150 of those rounds reloading into a full tube just to assess the gun with the maximum amount of weight. I never noticed any change in ejection from the positive ejection seen in the video.
I was pleased with the results, although I will test again in some less stable positions to see if I can make the gun choke. The urbino and its limb saver pad made this gun muuuuuch funner to shoot... The only other plans for the gun would be having the carrier welded up and an arredondo bolt release pad installed-I doubt the weight of those would put the inertia system over the edge. 
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The inertia recoil is not inherently unreliable or even less reliable with added mass. What that added mass does is narrow the operating specification down according to the amount added. All other things being equal, the more mass that is added, the more energy the gun will absorb before cycling. In other words, the action has less available energy to function as mass increases.
As the gun gets dirty and as the lube migrates out of the action, more energy is needed to cycle the action than before due to added resistance. This is true even for a stock gun, but the M1 and M2 are designed to be light weight in order to capture more of that recoil energy for a longer shooting/cleaning interval. Compare this to an M4, which would not exist at all if not for this problem. With gas capture, mass becomes your friend since it reduces felt recoil without effecting the action. You may not see any of this in your config immediately or at all, but added mass makes the M1/M2 more ammo sensitive and less tolerant of dirt and debris than it otherwise would be. It may take several thousand rounds in order to see this at the range, or maybe just a few dozen in the mud and sand of a military environment. If you want to accessorize it as a defense gun, make sure you thoroughly test the ammo you intend to use and keep the gun clean, lubed and stored barrel down. |
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Quoted:
The inertia recoil is not inherently unreliable or even less reliable with added mass. What that added mass does is narrow the operating specification down according to the amount added. All other things being equal, the more mass that is added, the more energy the gun will absorb before cycling. In other words, the action has less available energy to function as mass increases. As the gun gets dirty and as the lube migrates out of the action, more energy is needed to cycle the action than before due to added resistance. This is true even for a stock gun, but the M1 and M2 are designed to be light weight in order to capture more of that recoil energy for a longer shooting/cleaning interval. Compare this to an M4, which would not exist at all if not for this problem. With gas capture, mass becomes your friend since it reduces felt recoil without effecting the action. You may not see any of this in your config immediately or at all, but added mass makes the M1/M2 more ammo sensitive and less tolerant of dirt and debris than it otherwise would be. It may take several thousand rounds in order to see this at the range, or maybe just a few dozen in the mud and sand of a military environment. If you want to accessorize it as a defense gun, make sure you thoroughly test the ammo you intend to use and keep the gun clean, lubed and stored barrel down. this is bay far one of the best answers/descriptions i have seen on how the platform works. well done 
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For a stock M2, you've got around 1 pound to play with before the minimum spec loads chug-out. Stepping up to buck & 1oz. slugs, as noted, it beccomes an escalating trade-off, increased power from the shell vs. increased mass of your tacti-gasm.
There are a couple of solutions. For shell carriers, 3 GunGear is a best-of, in industrial velcro & nylon, carrying 8 rounds on the gun, with SOE making the very nice micro-rig, if you'd rather not weight the gun. If you really play with the system, Triangle Shooting Sports(TX) and Accurate Iron (here in OK), will lighten your bolt. TMB, the Arredondo has a (repeated, bad, consistent) tendency to rotate. GG&G's replacement latch/retainer & button assembly isthe best of current button replacements, though the DMW Speedbar is cheap & works very well. Angle Porting makes a very nice (but snag hazard?) release, here: Angle Porting You could also have your release button hole reamed to accept the slightly larger Beretta 1200 series release(+/- 1/4"). |
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Yikes, forgot about my thread lol.
Thanks for the break down homeinvader, that's good info. I fully realize the ammo limitations caused by adding weight, my main interest is making sure the gun can run defensive ammo with the weight of useful accessories. ...and curiosity of course. If anyone knows if the urbino weighs less than the oem benelli stock that would be useful to know-I meant to weigh each when I was installing the urbino but forgot. Quoted:
Try it with some 1oz. 3 dram loads while fully weighed down. Does that gun beat up your cheek? You mount it very low in the pocket and it seems to rock your face pretty good. It's been a while since I ran lighter loads through the gun, I noticed occasional fte's with only the mag tube and side saddle, so it wouldn't be particularly useful to test with the increased weight of the clamp and light. My mug was not bothered in the slightest this time around, the urbino makes the the gun quite comfortable to shoot squared up. The oem stock was not comfortable to shoot that way. Quoted:
For a stock M2, you've got around 1 pound to play with before the minimum spec loads chug-out. Stepping up to buck & 1oz. slugs, as noted, it beccomes an escalating trade-off, increased power from the shell vs. increased mass of your tacti-gasm.
There are a couple of solutions. For shell carriers, 3 GunGear is a best-of, in industrial velcro & nylon, carrying 8 rounds on the gun, with SOE making the very nice micro-rig, if you'd rather not weight the gun. If you really play with the system, Triangle Shooting Sports(TX) and Accurate Iron (here in OK), will lighten your bolt. TMB, the Arredondo has a (repeated, bad, consistent) tendency to rotate. GG&G's replacement latch/retainer & button assembly isthe best of current button replacements, though the DMW Speedbar is cheap & works very well. Angle Porting makes a very nice (but snag hazard?) release, here: Angle Porting You could also have your release button hole reamed to accept the slightly larger Beretta 1200 series release(+/- 1/4"). Good info, I won't bother with the arredondo release I guess. One nice thing about the 3 gun gear saddle is that if I come across ammo that is on the threshold of reliability I can just rip the 8 round holder off the gun for a quick loss of weight. |
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