Atsalakotos Posted May 31, 2014 Report Share Posted May 31, 2014 I was browsing around ebairsoft and saw this at the home page. Says M type M870 which could mean anything, but the way they are setup in the front looks identical to the shell ejecting Maruzen M870 to me... What are your thoughts? Link to post Share on other sites
harborne blue Posted May 31, 2014 Report Share Posted May 31, 2014 Looking at what seems to be the barrel fitting on the lower ones, I'd say it's a Maruzen clone. Shame as a stock like that for the TM gas or springer shotguns would have been fantastic and sold like hot cakes. Link to post Share on other sites
swatti Posted May 31, 2014 Report Share Posted May 31, 2014 Theres a topic about these. Those are MZ springer clones. Link to post Share on other sites
paranoiddroid Posted June 1, 2014 Report Share Posted June 1, 2014 MZ are the old one shot shotguns right? Cheap enough to acquire and can in a lose for the externals? Link to post Share on other sites
swatti Posted June 1, 2014 Report Share Posted June 1, 2014 Maruzen CA870 based. Yes, they are quite old. G&P shotguns are direct descendant from MZ design alltho somewhat improved materials in sertain parts. ACM clones have VERY much improved cylinder-units but ACM "gearbox" shell cannot mount real-steel stocks like MZ and G&P can. I have several mix-breeds as i call em. Shotties made from MZ, G&P and ACM parts. One has majority of its internals made from steel by me. I have also converted all of my M870s to AEG-barrels and R-hops. The barrel-conversion is quite easy and a vast improvement over the original. While these shotguns shoot only one round, they are VERY effective skirmishers. Also since they take RS-parts rather easy one can pimp em out as much as an AR15 Link to post Share on other sites
ShinSeiki Posted June 1, 2014 Report Share Posted June 1, 2014 Is this the "GBB M870" they were promising? I am disapoint. Link to post Share on other sites
Atsalakotos Posted June 1, 2014 Author Report Share Posted June 1, 2014 Nowhere close to the cloned TM M870 they showed a video of a while ago. Maybe that project was shafted...? Too bad because I would really want another one or two M870s for different configurations Although, one could still hope. Link to post Share on other sites
swatti Posted June 2, 2014 Report Share Posted June 2, 2014 Unless this is a totally new gas-system the one in the pic is a springer. Im not paying half my kingdom for a second-rate TM garbage when I can eventually pay for second-rate ACM an ACM-price. Mind you, get yourselfs a MZ based springer M870, i promise you won't be dissapointed. Link to post Share on other sites
steelfallenangel Posted June 9, 2014 Report Share Posted June 9, 2014 Yea I've read that the internals of the Maruzens were not half bad. That they were good enough for people to bother buying the aformentioned G&P metal bodies to house them. That and they were chrono'ed around 350 vs. the huge 420 or so the G&Ps ship with. These pictures remind me of my own Marushin that I'm waiting to get back. Gotta call that tech to hear when it's due since I had him shave the arms to mount that MOE SGA forend and stock. Link to post Share on other sites
NeoVeNoM Posted June 17, 2014 Report Share Posted June 17, 2014 Looks like they are out. black and tan http://www.ebairsoft.com/aabb-style-shotgun-p-7739.html Link to post Share on other sites
kojak Posted June 17, 2014 Report Share Posted June 17, 2014 Looks like it comes with a G&P style flush mag too; the Maruzen and clones came with a silly box mag. I'm guessing they cloned the Magpul plastics at that price. Link to post Share on other sites
swatti Posted June 19, 2014 Report Share Posted June 19, 2014 Soo, ebair actually does sell things other than pink gopro accessories... May need to get me one these. Il report on internals. Link to post Share on other sites
jv83 Posted June 19, 2014 Report Share Posted June 19, 2014 A lot of people complained about the Maruzen internals, but mine ran with an Angs m140 spring for more than 5 years without breaking. The piston recently broke due to a bb being stock between it and the cylinder. Got the G&P cylinder kit its not as good as the Maruzen but still gets the job done. Sealing airleaks and tweaking the hop one can get wonderfull sniper like accuracy with it. But it is very un-shotgun-like compared to other airsoft shotguns. Link to post Share on other sites
aznriptide859 Posted June 19, 2014 Report Share Posted June 19, 2014 My only complaint was the hopup setup was kind of stupid. Link to post Share on other sites
jv83 Posted June 19, 2014 Report Share Posted June 19, 2014 Yeah the hop is very finicky. I got the charger version where it is adjustable via a small grub screw on top of the barrel. Seems like something many people copied to their non adjustable version, by drilling and tapping it themselves. I added an Angs hard hop spring to accompany the m140 spring. Also worth noting, the cylinder volume is too small to create enough pressure when using the long barrels, like the one pictured, resulting in drop in fps. (this drop differs slightly with different springs and inner barrel setups). Link to post Share on other sites
swatti Posted June 21, 2014 Report Share Posted June 21, 2014 Takes 30min to convert to your gun to AEG-barrel & hopup, better yet, R-hopup. I made myself a steel cylinder and piston along with the cocking rods / racking arms. The power of the mz-based shotties is their non-shotgun-likeness. They are basicly light weight snipers. Link to post Share on other sites
jv83 Posted June 21, 2014 Report Share Posted June 21, 2014 Sounds cool Swatti, any more info on how you did this? Saw that G&P made a steel sear and trigger set, but seem pointless as long as the piston and cylinder are still plastic. BTW the G&P internal barrels have a huge internal diameter and are not very good. Link to post Share on other sites
swatti Posted June 21, 2014 Report Share Posted June 21, 2014 30k feet in the air atm. Once I get back I can post a small quide how to do the barrel-conversion. It's stupidly easy. Link to post Share on other sites
swatti Posted June 21, 2014 Report Share Posted June 21, 2014 Can't edit posts? Even recent... Oh well. Here's a pic of the arms and the small locking part made from steel https://imageshack.com/i/j6d07uj Link to post Share on other sites
jv83 Posted June 21, 2014 Report Share Posted June 21, 2014 Looks good. Will see if i can find the time to post my findings in testing the barrel length in relation to cylinder volume tonight. Link to post Share on other sites
swatti Posted June 21, 2014 Report Share Posted June 21, 2014 I was worried a heavy steel piston would be slower and i'd lose fps but the larger bore cylinder and tighter piston head ended up increasing my fps... Piston head also from steel and later ported Link to post Share on other sites
jv83 Posted June 21, 2014 Report Share Posted June 21, 2014 If you have any pics. i'd love to see them. I modified a K2 aps-2 pistonhead to fit the std piston. It worked wonders for airseal and it made the gun very silent. Link to post Share on other sites
swatti Posted June 21, 2014 Report Share Posted June 21, 2014 K2 head was too small for the new cylinder so I was forced to make a new piston head. Made it very loud Got some pics, il try to find em. Link to post Share on other sites
jv83 Posted June 21, 2014 Report Share Posted June 21, 2014 I did a small comparison with the G&P upgrade parts, the piston-head is a better fit than the MZ but the overall quality of the plastic piston and cylinder is worse. Even had some small moulding burrs on the nozzle, but generally OK quality. The steel spring-guide does not use bearings like the ANGS version. With my setup of angs spring-guide,angs 140 spring, K2 piston-head and 6,04mm inner barrel, the ultimate barrel length is somewhere >30cm but <40cm. I ended up sticking with 40cm since I liked the look of the cut down but still longer G&P outer barrel. Link to post Share on other sites
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