Bing Feng M870 shorty shotgun

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Here we have an oldie but unfortunately not a goodie, unless you’re just after a wall hanger.

It has piss poor performance, when you can manage to get it to actually shoot that is. Apparently they were pretty dismal straight out of the box, and the only video I could find on it was in an Asian dialect, couldn’t find any other information on upgrading performance whatsoever, aside from Google AI’s way wrong information talking about GBB upgrades that obviously don’t apply to a spring powered gel blaster

What am I talking about when it comes to how it performs?

Pump, pull trigger… :dash: No gel
Pump, pull trigger… :dash: No gel
x10 maybe you’ll get two to shoot out
Then it’s back to pumping going nowhere

(as it’s a double barrel setup which is interesting and probably why it performs so badly FPS wise, poor seal. Other than that I believe it’s a feeding issues due to its design which is pretty spun out)

Most likely you’ll just sit there pumping it and pulling the trigger all day with the occasional pair of gels firing out, bit disappointing so I decided to pull it apart to have a look inside to see if there is anything that can be done to improve on its performance, not that I’m an expert in these matters but i figured it’s worth a look since I only paid $10 for it second hand

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Firstly, it’s waaaaay greasy, and it almost seems as if it’s been submurged in water and not left to dry properly as besides the grease and oil, mine literally seems to have traces of water all through it :grimacing:

Good old second hand market :sweat_smile:

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Internally it doesn’t seem much different to Hanke m97, operating with a fairly similar principle, minus the fact it’s magazine loaded not “hopper fed” like the m97 and it’s double barrel design, which I think was it’s downfall

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It has a decent sized aluminium cylinder and vented piston head so you would think it would perform better than it does when it does actually shoot, then again, pretty weak air seal at the T piece as far as I can tell

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The spring it comes with is pretty chunky, next to an m90 it’s slightly longer, I would hazard to guess it’s either an m95 or m100

The spring next to an m90

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I feel like it’s biggest issue is the gels feeding up the t-piece, it’s like it’s not aligned very well where the magazine meets the bottom of the T piece, or maybe it’s an air seal issue, either way you’d still have to pump it a heap of times before the first gels reached the chamber regardless, but you can sit there pumping n pulling the trigger and pumping and pulling the trigger for ages and the gels rarely feed up enough in the T piece to allow them to be fired

I would love to hear if anyone else has one of these and has ever worked on theirs and made any progress improving its performance although I’m not sure there’s really anything you can do to it to increase the performance without major modifications that are likely above my abilities ATM

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At the shop we just discounted them and sold them as wall hangers, the examples that did feed and fire only did just over 100FPS a lot of the time.
I never spun screwdrivers on one but the previous tech wasted many hours (to be fair most of his hours might have been wasted!)

That spring, can’t be compared to any M-rated spring, purely as material, coil spacing, diameter, and length all play factors and it is all unknown. Way back when everything was rated in mm wire diameter, I had 1.2mm springs of similar length out performed by 1.1mm springs. Anyway, unless it is M-rated, its a random spring.
Best way to check is to place it on a long screwdriver on some scales and compress it to where it would be at rest and at compressed in the blaster. It is a lot of hassle but only real way to check the pressure it will provide.

Probably an o-ring and checking the t-piece to nozzle and cylinder head seals are the best place to start, but also checking gels are being pushed by the “magazine” and have space to get chambered is in order too.

If you can get it feeding, you are doing better than most! No one really bothered with these unfortunately, mainly as there were better options like the M97 and then a bit later the XYL.

A mate I knew but haven’t seen in a long time got his working but it was never a stellar performer and took a good bit of trial and error to get it there. Can’t remember any details though sorry.

Best of luck with it, and good write up mate :slight_smile:

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Yeah, I had one, and gave it away…
It was a woeful performer…
But cheap , and no others like it at the time…

The LDT 870 is a much better unit.
A bit more exxy, but better weight, feel, and performance,

I haven’t used it for awhile, but I think it had gel / dart shells.?

Much better gel performer, anyway…

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If you have a bad taste in your mouth…

Here’s Corey…in all his glory…to induce vomiting…!!

Best to puke, all the bad taste out…!!
:rofl::rofl::face_vomiting:

It must be good if Corey says so…!!

Hmmm… pay it later system…

I guess they used that, system, with the ATO…!!