BerserkDS Posted May 17, 2012 Report Share Posted May 17, 2012 Hey guys, I just picked up a Marushin Mossberg M500 6mm recently, and it fires 3 bb's per shot. Doesnt the 6mm version of this shotgun shoot 5 bb's per shot? I took the gun apart, and see that there is a pin pressure fitted in the middle of the chamber so that it holds only 3 shots. in theory if this pin is removed (would have to drill it out) it will hold the 5 shots. another thing, with it only being able to fire 3 shots, at a capacity of 150 rounds, I am able to get 50 shots fired total. BUT, the gun doesnt hold enough gas to fire 50 shots. also, I noticed this gun has horrible accuracy. i took it apart, cleaned it, and still it shoots everywhere but your target. Im really confused, can anyone help me out please. thanks! Link to post Share on other sites
Wingmann Posted May 17, 2012 Report Share Posted May 17, 2012 - Yes, originally it shoots 5 BBs per shot. If yours is second hand it's been modified. - You should have enough gas to shoot all 150 BBs. Load time is extraordinarily long because the reservoir is quite big, so keep the gas bottle there for 30-40 secs. - The main problem of the gun is that it doesn't have any kind of hop. I'm thinking ways to modify one and add a fixed but adjustable hop. As soon as I can get to it I'll post the results and process. Link to post Share on other sites
renegadecow Posted May 17, 2012 Report Share Posted May 17, 2012 When you remove that pin to bring it back to 5 rounds per load, remember to plug it up with something because gas is going to leak out of that hole. The 6mm version doesn't have hop, but the 8mm's do: http://tech.airsoftcanada.com/Marushin/Marushing%20M500_1.gif It's not at all hard to add a hop on yours, however it means some custom fabrication and drilling a hole in your barrel. Link to post Share on other sites
shmook Posted May 17, 2012 Report Share Posted May 17, 2012 I think some marushins were 3 shot, the maxi slugster if I remember correctly Link to post Share on other sites
WhiteHawksan Posted May 17, 2012 Report Share Posted May 17, 2012 incidentally, you will also require steel charging arms if not already fitted. Link to post Share on other sites
BerserkDS Posted May 17, 2012 Author Report Share Posted May 17, 2012 The gun does have an adjustable hop up, which is very similar in design to the 8mm hop up. I own an 8mm version as well. As far as gas fill, its hold enough gas for about 30 shots, enough to dump the entire load of bbs if it fired 5 shots instead of 3. I did buy it second hand, but it does not spear to be modified as the casing, even by looking down the chamber with a flashlight I don't see any tooling marks, the chamber unit is all black. Link to post Share on other sites
shmook Posted May 17, 2012 Report Share Posted May 17, 2012 I forgot to mention too, my clone 5 shot will dump all rounds on a single charge, and also enough gas left for another 10 - 20 shots on top of that. I did go over it fully to get it gas tight though, and it will hold gas for months now. I've had 3 in total, all clones, and all had a similar gas capacity. None had or needed steel charging arms either... Link to post Share on other sites
BerserkDS Posted May 17, 2012 Author Report Share Posted May 17, 2012 The gun is horribly inconsistent as well, even after replacing all the orings Link to post Share on other sites
WhiteHawksan Posted May 17, 2012 Report Share Posted May 17, 2012 check the operation of your valve, the state of your hammer etc My clone 8mm had a sticky valve return spring until it greased the hell out of it with nice thick slimy sillycone grease. Link to post Share on other sites
P.S.I. Posted May 18, 2012 Report Share Posted May 18, 2012 One issue in regards to the accuracy is the fact that your firing multiple rounds simultaneously through a single barrel. The BBs at the back of the stack are pushing those up front, so they are bound to fly erratically. The point of a shotgun is to have a spread so IDK how much accuracy one can really expect there. Link to post Share on other sites
BerserkDS Posted May 19, 2012 Author Report Share Posted May 19, 2012 The spread was ridiculous, and I mean that to the extreme. Literal could not shoot what you're aiming for within 20 feet. I fixed the issue, I turned off the hop up and shoots good for the distance I need it. Now, still is inconsistent...250 Fps, 320 Fps, 150 Fps, 400 Fps, and even one 500 Fps. Every time I've chronoed it, its been completely different Link to post Share on other sites
WhiteHawksan Posted May 19, 2012 Report Share Posted May 19, 2012 is your chrono off? To me, it sounds very much like the hammer/valve is broken/damaged/stuck. FPS is determined by the amount of gas pushing the bb's out. It sounds like it's either the hammer or the valve are not opening/closing consistently. Link to post Share on other sites
Tank Posted May 22, 2012 Report Share Posted May 22, 2012 Are the chrono results from a single BB or multiple?? It's very difficult to get an accurate reading on multiple rounds. Link to post Share on other sites
BerserkDS Posted May 25, 2012 Author Report Share Posted May 25, 2012 It seems like its averaging out to 220-240 Fps on green. Is this normal for this gun? Seems rather weak for a gun designed for 134a.. Link to post Share on other sites
shmook Posted May 25, 2012 Report Share Posted May 25, 2012 As above, is that for 1 bb, or multiple...? Link to post Share on other sites
renegadecow Posted May 25, 2012 Report Share Posted May 25, 2012 Speaking of 1 bb, just checked the Marushin website and they made a new run of full stock Mossbergs and cruisers. Only difference is they come with perforated heat shields as standard and for some reason only fire 1 bb at a time. Link to post Share on other sites
BerserkDS Posted May 26, 2012 Author Report Share Posted May 26, 2012 those chrono reading are with Multiple bbs each shot. I saw that too while trying to find info on this gun. One bb at a time Seems really odd. Link to post Share on other sites
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