sethvacn Posted May 10, 2015 Report Share Posted May 10, 2015 Got my m870 3 days ago, was about to play this morning, got to the game, and on the first rounf I started a sprint, got about 10-15 meters, and I completally faceplant! The shotgun goes flying:( As I try to shoot it the bb`s just scatter to all sides when I fire. upon checking the barrel, I see that a black plate in front of the inner barrels has been moved so the barrels are slightly covered. I almost started to cry, I didn`t get to fire one single shot with it:( So I will be delivering it to my local smith to see if he can fix it. I hate my life now. Quote Link to post Share on other sites
you can`t shoot me Posted May 10, 2015 Report Share Posted May 10, 2015 Got my m870 3 days ago, was about to play this morning, got to the game, and on the first rounf I started a sprint, got about 10-15 meters, and I completally faceplant! The shotgun goes flying:( As I try to shoot it the bb`s just scatter to all sides when I fire. upon checking the barrel, I see that a black plate in front of the inner barrels has been moved so the barrels are slightly covered. I almost started to cry, I didn`t get to fire one single shot with it:( So I will be delivering it to my local smith to see if he can fix it. I hate my life now. The inner barrels are secured with a small plastic piece at the front, it just clips onto the three barrels at the front to keep them in position so if it is only a case of it slightly out of position blocking the barrels it should be easy to fix. You might even be able to look down the barrel and use a long screw driver to push it back into place onto the three barrels without having to take it apart. Quote Link to post Share on other sites
Alias1983 Posted May 11, 2015 Report Share Posted May 11, 2015 Yeah that design is flawed for sure, I figured it would be uber omg. Guess I should get the cam instead Quote Link to post Share on other sites
BioRage Posted May 28, 2015 Report Share Posted May 28, 2015 (edited) So... judging by the last few pages.. stay away from the full size m870 tactical? @_@ kinda want one, but a bit afraid of all the that keeps popping up in problems. Edited May 28, 2015 by BioRage 1 Quote Link to post Share on other sites
Alias1983 Posted May 28, 2015 Report Share Posted May 28, 2015 I want to get another one but I got mine off evike so who knows. I bet if I go one off an overseas site it would work 100% Quote Link to post Share on other sites
Danke Posted May 28, 2015 Report Share Posted May 28, 2015 Year and a half in and mine's still running fine. 1 Quote Link to post Share on other sites
DeltaZero Posted May 28, 2015 Report Share Posted May 28, 2015 I want to get another one but I got mine off evike so who knows. I bet if I go one off an overseas site it would work 100% Mine arrived from overseas with a broken loading arm.. so not all of them! 1 Quote Link to post Share on other sites
Alias1983 Posted May 28, 2015 Report Share Posted May 28, 2015 (edited) This saddens me as I want a tm gbbr m4 and I'm scared Dave. Should I just get a ghk and devilhuntermod the mags? Edited May 28, 2015 by Alias1983 Quote Link to post Share on other sites
DeltaZero Posted May 29, 2015 Report Share Posted May 29, 2015 I reckon the TM GBBR will be mint! I'll be having one for sure! Quote Link to post Share on other sites
blobface Posted May 29, 2015 Report Share Posted May 29, 2015 Should I just get a ghk and devilhuntermod the mags? yes Quote Link to post Share on other sites
Habakure Posted May 29, 2015 Report Share Posted May 29, 2015 And some skittles. Quote Link to post Share on other sites
BioRage Posted June 1, 2015 Report Share Posted June 1, 2015 (edited) Welp, Have one in-transit now, let's hope it holds up to my expectations! Edited June 1, 2015 by BioRage 1 Quote Link to post Share on other sites
BioRage Posted June 4, 2015 Report Share Posted June 4, 2015 Got it yesterday, will test it out tonight at a local field. Quite heavy, I like it.. finish isn't as great as the APS CAM870, but that's ok. They really coulda made it smaller.. but I guess the "SAT CNC Shortened outer barrel" exists now for a reason.. Just afraid of this thing breaking on me, haha! Has anyone dremeled/drilled a piticanny rail successfully on the stock pump grip? Quote Link to post Share on other sites
GSO-Geko Posted June 4, 2015 Report Share Posted June 4, 2015 (edited) Has anyone dremeled/drilled a piticanny rail successfully on the stock pump grip? Yes Edited June 4, 2015 by GSO-Geko Quote Link to post Share on other sites
Alias1983 Posted June 4, 2015 Report Share Posted June 4, 2015 Brain exploder cut his outer down and used a GNP choke with a dremmel Quote Link to post Share on other sites
renegadecow Posted July 24, 2015 Report Share Posted July 24, 2015 Just got something to clarify. I'm opening up Calbur20's 870 to fix a slow leak on the main valve (spring just needs more tension to hold green gas properly) and to see if I can make the 6 shot actually load 6 instead of 5. I took a look at the loading arm's condition and the posts were perfectly straight. Not only that, it appears to be made out of steel as you can see below being picked up by a magnetic screwdriver. I had the impression that these were made of monkey metal which is why they sagged in the first place. Is this perhaps an update by Marui or something? Quote Link to post Share on other sites
DeltaZero Posted July 24, 2015 Report Share Posted July 24, 2015 I think Marui must have changed the materials and made an update. The broken one that came out of my early release Breacher was definitely made from monkey metal.. you could see the air bubbles etc... Good to know they've noted weaknesses and made improvements! Quote Link to post Share on other sites
Brigg Posted July 25, 2015 Report Share Posted July 25, 2015 What is the reason exactly for it loading 5 shots instead of 6 anyway? Mine was one of the first batch in the US and it did that out of the box. Because of that and the really unstable feeling barrel I stopped using it in favor of a cam870. And it's sat in the closet ever since. I don't suppose there's any fix for that wobbly as hell barrel while we're at it too, is there? Quote Link to post Share on other sites
renegadecow Posted July 25, 2015 Report Share Posted July 25, 2015 Can't say for sure, but I've put in a stiffer nozzle lock spring to aid timing and slightly stretched and tempered the main nozzle spring itself. Different bb weights also seem to influence it as heavier bbs are moved up the feed tube slower. The loading arm just goes down and up and then all over again so fast it's like a 50rps AEG skipping a beat. Quote Link to post Share on other sites
renegadecow Posted July 25, 2015 Report Share Posted July 25, 2015 Looks like the spring adjustments worked. No more leaks and loads 6 now with .25g, but if you rack it too fast it goes back to 5. I may have overdone the hammer spring a tad though. Quote Link to post Share on other sites
blobface Posted July 25, 2015 Report Share Posted July 25, 2015 Are you sure that not's just measuring the spray of green gas instead of the bb? 1 Quote Link to post Share on other sites
Alias1983 Posted July 25, 2015 Report Share Posted July 25, 2015 Wish mine wasn't a hoopty! Quote Link to post Share on other sites
renegadecow Posted July 25, 2015 Report Share Posted July 25, 2015 Kidding aside, yes, that was just a reading of the gas cloud. A proper reading went 336fps with 3x .25g bbs and green gas, 28C. Before any of the mods it was doing 280fps. Quote Link to post Share on other sites
renegadecow Posted July 26, 2015 Report Share Posted July 26, 2015 The main valve started to leak again in today's game though it would do so at random instead of just leaking as soon as green gas was put in. The spring was stretched 130% from original length and I think it's more of a seating issue than sheer pressure. Will do the same mods but to a breacher model this time and try 150% length to see if it helps. Quote Link to post Share on other sites
renegadecow Posted July 29, 2015 Report Share Posted July 29, 2015 With much sciencing later, it really does boil down to pressure. Both 130% and 150% stretched springs failed when they got warm enough. Now put in an unknown spring, probably a PDI170 but I can't be sure. Stops the leak dead but also resists the hammer spring to only do 215fps with .25g. Will be trying weaker springs and harder hammer springs. AEG spring installed, stock stretched spring at right. Quote Link to post Share on other sites
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