Post by bram762 on Mar 17, 2014 21:36:52 GMT -5
Hey all, I'm pretty new to the WWII scene of airsoft. Recently I've ben made a convert when I purchased a WE p08 6inch luger with a snail mag, sold my m16vn, and got an AGM mp40. I've owned, or taken apart v2's in mp5's to v7's in m14's and have a pretty sound grounding in fiddling with gearbox's, hop-up's, and how to strengthen the main body of airsoft guns. Before even putting 200 rounds through this mp40 I've installed a madbull 6.01 tightbore, Tokyo marui eg1000 short motor, spring guide with bearing, and a chopped m135(took about a half inch of it). I've seen a lot of threads about how to, and what to replace/upgrade in the agm mp40, and I'd like to give what knowledge I've acquired in the past couple days with this mp.
-The barrel, and hop-up unit are unique to this weapon. As with later model lower end Chinese AEG's they've elected in efforts to save money and time to NOT mill out a fixed spot at beginning of the inner barrel. As with almost any Tokyo Marui, clone, or not this done so that when the hop-up rubber is on the barrel (over the fixed cut-out) and a spacer is applied over the cut-out on the rubber it dips down into the chamber, preforming the wonder job of- giving you hop-up. The AGM mp40 hop-up chamber
is reminiscent of an ak type with a sliding bar held by two small screws that moves a se-saw type arms down onto the bucking. Holding the inner barrel is a plastic cuff that slides onto the barrel, and than slides into the hop-up chamber. The plastic cuff that holds the inner barrel has the small cut-out required for the hop-up, and is where the bucking slides on. This means for the air to push the bb, it has to go through the bucking, past the plastic to the inner barrel. 3 pieces, fatal flaw for air compression, and limits the user on the type of bucking. To get around this problem, and to install an AEG type tightbore I cut off about a half inch off the plastic cuff, right where the bucking slides on. After doing so I used a drill bit with the same inner diameter as the plastic cuff, and smoothed out where I cut so that the tightbore could slide past. Pushing the tightbore until it stuck through the other side of the cuff at the same length the plastic was, I put on the bucking, wraped the hop-up arm in Teflon tape(prevents side to side play) and field tested the weapon. 50yards hitting a torso sized bucket in the wind with .25's was not a problem, I'm going to do a longer range test when I get more bb's(yeah, im that broke lol). I'm trying to find different bucking's that could fit but and AEG bucking isn't wide enough to fill the chamber, and a pistol type hop-up just doesn't match up right. Hope this helps sooombody with there AGM, tightbore's are not over rated, they're pricey for good cause, tight tolerances, tight groups.