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Posted: 2/26/2003 6:56:04 AM EDT
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I have a question for any AK experts out there. The following video is of me and my friend bumpfiring our AK's. In the background is my friend with a stamped MAK90 with a welded barrel nut that is stock except for a recoil pad on the carrier. In the foregound is me with a milled SLR95 with no modifications. The MAK's fire rate seems almost double that of the SLR and we cannot figure out why. Is it the SLR's break? Does milled vs. stamped make a difference? Before anyone asks, we are both using indentical techniques and swapped weapons several times during the day and got the same fire rates on both guns. Any ideas?? home.earthlink.net/~autoglassparts/doublebump.wmv |
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same ammo in both? the only things that come to mind are: gas tap port hole size. bolt/carrier mass. recoil spring rate. internal binding and friction. also, something that troubles me is the mak has the vented gas tube. another factor may be the additional weight of the bulgarian milled rifle...requiring more time to accelerate rearward to accuate the next shot. |
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the vented gas tube geometrically increases the rate of exhaust gas venting as the piston travels rearward and exsposes more vent holes thru which the gases may escape into the atmosphere...instead of being used to continue driving the piston. it's not a problem....it's just something i would suspect would slow the mak down more so than the less vented akm tube on the bulgy. |
 Yes, it is a drum loaded with about 60 rounds. I know, heavy gun made heavier. I know that now. The MAK was using a 55 round banana but it is still at least a couple of pounds lighter. Thanks for all the help guys.Just for the hell of it, here is a better video of just the MAK. This thing runs like hell! home.earthlink.net/~autoglassparts/singlebump.wmv |
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It comes down to two (or more things) The weight of the gun and the weight of the trigger. I have heard of guys that can vary the rate of fire as they are shooting their guns. Try switching rifles and see if it stays the same for the guns fired. It could also just be technique. BISHOP |
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Campy, There is no progressive exposure of vent holes in the original gas tube. Once the piston passes the gas block, the gas immeadiately starts washing over the piston and blowing by in the longitudnal grooves. Gas takes the path of least resistance. Put a piston in the tube and daylight it from the rear and see how much area there is around the piston. |
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Hard to say I have footage of a 74 and it is quick as hell. While my 47 is slower. see video www.redstararms.com/uploads/hac.WMV www.redstararms.com/uploads/pond.wmv |
| This sounds nuts but it works. I put a deep well socket over my trigger finger when bump firing. It stops your finger from flexing and resets the trigger faster. I've got un fricken believeable rates of fire from my SAR1 using this method. I also used a T handle allen wrench as a subsititute for my finger. Once again the rate of fire was alot higher than I could get without the other tool. |
I bet the BATF hates you heyre. Rickinvegas- Makes any innocent hunting rifle a full-auto baby killing, pollitically incorrect, assault rifle. I bet they would ban all semi autos if we could all bump-fire or set a limit for weight of a gun and how good a trigger can be. |
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