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G&P Buffer Tube Gas Tank for Marui 870

g&p tm marui 870 m870 shotgun stock tank tube

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#1 CKinnerley

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Posted 26 March 2014 - 09:37 AM

I knew it'd happen eventually.  Not too surprising it was G&P either since they've been probably the biggest player so far in terms of other accessories for the TM 870.
 
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Kills a fair few birds with birds with one stone to my mind. They already make rifles designed for propane so this shouldn't struggle with the pressure like the Marui tanks do with makes their 870 a product I could actually buy (at last) as well as adding the AR accessory compatibility I know many have been after (myself included).  Looks like you can charge gas straight in from that valve in the top rather than having to take off the stock each time, which wouldn't be much of a drama with AR collapsibles but it does make life that bit easier.

 

Since the inner gas tank is removable as the outer buffer tube screws in the RS way I think it should mount AR lower base plates for some nice 1-pt sling options (on top of the QD sockets already integrated) and I'd wager RS/GBBr type pistol grips will fit as well which combined with the stock options makes for a lot ton of wiggle room to give it exactly the ergonomics the end user desires based on a whole range of products already on the market.  Adjustable LOP and grip angle (decided by the grip fitted) sounds about 1 million times better than the fixed stocks to me personally.

 

Only potential I see is that there looks like a lot of different points where components meet with o-rings to transport and store the gas, so hopefully they've got good tolerances and quality rubber parts on those areas to keep things non-hissy.

 

Also an old-school lighted forend for the RIS-adverse that still want to be a tiny bit tactical:

 

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#2 Tinkerton

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Posted 26 March 2014 - 10:06 AM

And now I know what my next fun will be. Was waiting for something like this since it was announced.

Any indication of price?

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#3 blobface

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Posted 26 March 2014 - 10:08 AM

God damn it G&P. Well played... 



#4 Wingmann

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Posted 26 March 2014 - 10:09 AM

*Note to self: Add to cart


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#5 PureSilver

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Posted 26 March 2014 - 10:39 AM

It looks to me like the 'cartridge' that screws inside the buffer tube is basically a replacement gas tank, so you can unscrew one and screw in another rather than faff about trying to fill the stock tube with a gas bottle.

 

That's kind of neat, but at the same time, it does impinge drastically upon the already quite limited volume of the stock tube. The original M870's gas tanks are pretty small too (for no good reason in particular) but these look very small indeed.

 

[EDIT]Although, it looks to me like with the way the 'buffer tube' screws in, if you wanted you could just screw in a regular RS buffer tube (as long as it was gas-tight) with a fill valve in the end and fill the entire tube with gas. If you did that with a rifle-length buffer tube and fitted an A2 fixed stock you'd have a lot of gas to play with.[/EDIT]


Edited by PureSilver, 26 March 2014 - 10:42 AM.

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#6 Kunlun

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Posted 26 March 2014 - 10:41 AM

Makes me regret selling my TM M870 ... Will definitely keep following this! 



#7 CKinnerley

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Posted 26 March 2014 - 10:46 AM

Any indication of price?

 

No hint at all right now, at least as far as I can see.  But the prototype there does look pretty sorted and ready to go in to production, might well be already.



#8 chas

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Posted 26 March 2014 - 11:05 AM

Given that the version for their own spring shotguns go for around 90$,

 

http://www.wgcshop.com/wgc2008/main/product_detail1.php?search_From=searchItem&item=GP-ACC-COP042S&search=special&rs=m870&catid=&cat=&view_choice=c

 

I can see this one haveing a pricetag in the 110-150$ range.



#9 PureSilver

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Posted 26 March 2014 - 11:10 AM

Those are plastic, I think. This is aluminium and has a ton of machining operations involved, plus it's the only example on the market. I'd say more like $150-200.


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#10 FTZ-WildeCard

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Posted 26 March 2014 - 11:12 AM

And I thought I had finally escaped the money pit that is airsoft related purchases... ah well. Once more unto the breach, dear friends, once more.


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#11 chas

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Posted 26 March 2014 - 11:15 AM



Those are plastic, I think. This is aluminium and has a ton of machining operations involved, plus it's the only example on the market. I'd say more like $150-200.

 

Are you serious? Plastic?

 

Anyway, this will finally come tru for me:

 

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#12 Horsem4n

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Posted 26 March 2014 - 11:18 AM

well, i would guess around 150 as well. the king arms stock adapter made for the Marushin M500 (same type of adapter as this, a copy of the Mesa Tactical adapter) was $75 and was made of aluminum.

 

 

i cant help but think of this + a 416c stock. but for another time.....


Edited by Horsem4n, 26 March 2014 - 11:19 AM.

Photobucket finally cracked down on 3rd party hosting and now all my pics are hidden


#13 FireKnife

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Posted 26 March 2014 - 11:24 AM

#Now sits and waits for a pistol grip and small enough tank option to come out.#

 

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#14 renegadecow

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Posted 26 March 2014 - 11:31 AM

^
What he said because another Serbu isn't such a bad idea.

#15 Horsem4n

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Posted 26 March 2014 - 11:37 AM

oh, i just noticed another thing. it looks like its demoing 2 separate tanks. like one tank in the stock adapter itself and another add on expansion tank for more space for use with regular buffer tube stock options. it doesn't look like you need to use both.

 

unless you guys got that already and im just slow.

 

the only thing keeping me from abandoning all other ideas is that i know i suck with a shotgun after scrimmaging with ACM M500s for a while.


Edited by Horsem4n, 26 March 2014 - 11:38 AM.

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#16 FireKnife

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Posted 26 March 2014 - 11:45 AM

^
What he said because another Serbu isn't such a bad idea.

 

The prospect of a gas cut down Ithaca / M870 MCS Breaching Config / Serbu Super Shorty is just too much to bear.

 

Especially as even at that size the capacity is still 10 tri-shots.

 

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They are (best at the top working down): 3x TM Colt Mark IV Series 70, TM Colt Mark IV Series 70 Nickel Finish, 5x TM 1911A1, 2x TM Night Warrior Custom, TM HK45, TM USPc, TM XDM.40, TM M&P9, 7x TM Detonics, TM P226 E2, TM New Style US M9, TM Foliage Warrior, 2x TM MEU, TM PX4, KJ Works CZ P-09, 4x KSC USPc, 4x TM P226, TM Glock 18C, TM Glock 26, 3x TM M9, KWA USPCT, 2x KSC USP .45, TM Glock 17,TM 5.1 Hi-Capa, WE Beretta M84 Cheetah, HFC Desert Eagle, KJ M9 Vertec ABS, KJ Works CZ75, 2x TK VP70M, WE XDM Compact, Army Detonics, KJ Glock 27, KSC SP2340, Maruzen PPK/S (Movie Prop), Maruzen P99, KSC M8000, KSC SP2022, KJ Ruger Mk.1, 2x KSC Glock 18c, Maruzen PPK/S (New Version), HFC M190, KJ P14-.45, WE Makarov PMM, 2x KSC Glock 26, ACM Beretta 1934, Marushin PPK SAS, Unknown M93R, WE 3.8 1911 and at the bottom a pair of KWC Colt Pythons.


#17 CKinnerley

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Posted 26 March 2014 - 12:34 PM

oh, i just noticed another thing. it looks like its demoing 2 separate tanks. like one tank in the stock adapter itself and another add on expansion tank for more space for use with regular buffer tube stock options. it doesn't look like you need to use both.

 

While the adapter piece is fairly chunky, it doesn't look like there's a tank inside there, at least to my eyes.



#18 bankz5152

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Posted 26 March 2014 - 12:51 PM

Looks like a peice of ###### to tap for HPA aswell if your that way inclined. This is an AWESOME product just not a fan of pistol grips on shotguns!

 

Looks like that could possibly be modded to take CO2 carts aswell, maybe with some work.


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#19 kagami

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Posted 26 March 2014 - 03:30 PM

 

Are you serious? Plastic?

 

Anyway, this will finally come tru for me:

 

http://i888.photobucket.com/albums/ac87/...

 

I'd love to do this too but the M93/UBR uses its own buffer tube :(

 

but yes, pretty much what everyone said, this is probably one of the most forward thinking accessories ive seen in a while. However it is clear that the buffer tube is very unique and proprietary, there's just no way that you could use a regular AR15 one without heavy machining, seeing as how the rear end is hollow and threaded to accept the gas cartridges. Definitely will use WA/Real pistol grips though


Edited by kagami, 26 March 2014 - 03:36 PM.


#20 PureSilver

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Posted 26 March 2014 - 03:52 PM

I'd love to do this too but the M93/UBR uses its own buffer tube :( [...] However it is clear that the buffer tube is very unique and proprietary, there's just no way that you could use a regular AR15 one without heavy machining, seeing as how the rear end is hollow and threaded to accept the gas cartridges. Definitely will use WA/Real pistol grips though

 

I think you could use real buffer tubes just fine, including the M93 and UBR ones, provided they can be made gas-tight. Instead of using the 'cartridges', you'd just seal the buffer tube itself up and put an inlet valve in it. Then you'd just fill the whole buffer tube (rather than the cartridge) with gas. Admittedly it would be slower to recharge but if you have to collapse the stock to unscrew the cartridge, screw in a replacement and then readjust the stock it wouldn't be much slower than the current design.


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