Lone_Bullet Posted March 26, 2014 Report Share Posted March 26, 2014 I thought the original has its outlet valve in the upper corner of the mag. But ok, didnt know about the expansion chamber. Good to know! Link to post Share on other sites
kagami Posted March 26, 2014 Report Share Posted March 26, 2014 just to be clear, you guys are considering sealing a real steel buffer tube but then what? The picture clearly shows that the buffer tube houses an inner tank assembly (which is longer) which threads into the buffer tube, the part which resembles a real ar15 extension just contains threads which I assume seals the inner tank to the grip assembly. If this is so, the only way to use the real buffer tube as the storage device is to figure out how to attach this interface at the front onto a real buffer tube, which doesn't sound easy at all (bottom pic, seems this is one entire picture): In addition, all AR15 buffer tubes have drain holes either at the bottom or at the very least at the end to drain water...any ideas about how to seal one? Now that I even think about it, only people who are considering using non traditional stocks like the ubr or m93 should care about this anyways, if you're using a normal AR15 aftermarket stock does it even matter? WOCs have real buffer tube threading fwiw. Link to post Share on other sites
Hopna Posted March 26, 2014 Report Share Posted March 26, 2014 Nice, this looks really great. Still hoping for someone to make a wooden stock though with a gas tank that can take green gas. That would make it hard to resist buying one. Link to post Share on other sites
Curly68 Posted March 26, 2014 Report Share Posted March 26, 2014 Oh dear. Wasn't too keen on the 870 but after seeing this, I am now! I wonder how close the clone will be to the TM and if this would fit that as well? Link to post Share on other sites
Horsem4n Posted March 26, 2014 Report Share Posted March 26, 2014 Er - no it doesn't. Look at the photo closely: The third photo (middle row on the right) shows the input valve for the expansion tank; you can see that that valve juts out beyond the rear of the stock adapter in the last photo (bottom, on the left). There's no way you would be able to fit a blanking plate or anything there with that valve sticking out, even if there were room in there for an expansion tank and a storage tank, which there isn't. What is noteworthy is that fill valve in the top of the adapter (under that black plate secured with Allen machine-screws), which I presume can be used to fill the buffer tube tank. If that's correct, fitting a sealed RS buffer tube (assuming the threading is correct) is now even easier, because you don't need to fit an inlet valve or make provision for it to be refilled; all you do is screw it in place and fill it up through that inlet valve in the top of the adapter. the way i see it, if they weren't optionally meant to be used without the buffer tube assembly, whats the point of making it into 3 pieces? why not make the buffer tube part of the stock adapter and have a larger buffer tube tank? they obviously wanted people to be able to install other buffer tubes and still have a gas source (even if severely limited). also, if the buffer tube tanks have their own fill valves, why bother putting a fill valve on top of the adapter? Link to post Share on other sites
kagami Posted March 26, 2014 Report Share Posted March 26, 2014 because it allows you to keep the tube installed and fill it up without having to remove the tank. The fact is G&P makes buffer tubes for WOCs, retrofitting one for this kit would just require some simple machining and tapping of perhaps an inch of threading inside of a part that they already mass produce. Link to post Share on other sites
aznriptide859 Posted March 26, 2014 Report Share Posted March 26, 2014 I think this just sold me on the M870 platform. Drake's shotgun here I come! CKinnerley, is this modeled after the Mesa Tactical or the Cavalry Arms SS one? Link to post Share on other sites
hwagan Posted March 26, 2014 Report Share Posted March 26, 2014 I reckon it won't be more than $170 and more than likely closer to $130. G&P are so good at what they do because they tend to concentrate on very few but extremely popular platforms, and make things in large volumes. Their AR parts are very reasonably priced in most cases for the quality, because so many people have AR's and G&P can keep cost down based on volume. G&P are probably well aware there's a whole *suitcase*-tonne of people waiting for these, as evidenced by this thread, so they'll knock them out at a nicely affordable price and recoup their costs in a short space of time by selling loads of the things. Link to post Share on other sites
TheFull9 Posted March 26, 2014 Author Report Share Posted March 26, 2014 they obviously wanted people to be able to install other buffer tubes and still have a gas source (even if severely limited). Edit - Do buffer tubes usually have threading inside the back end? Not sure they do but I've seen more AEG ones than RS and I can't recall exactly. Speaking generally I think everyone's got a tad carried away here. In my humble interpretation, this product will work in the way displayed by the final picture supplied by G&P there, using all the included G&P parts and in no other way. There's definitely not enough room in the adapter block for that to be used alone without the buffer tube and the supplied gas tank is most likely made the way it is (rather than a full on buffer tube full of gas) because it was cheaper and easier to manufacture the kit that way given the parts and machine processes G&P already have setup. If you've got an AR stock with an open end (like the good old LE) you can fill up from there and presumably if you've got anything with a closed end you fill via the valve right up top there. Although perhaps the interface valve between the cylindrical tank and the adapter block is one way? Then again I'd think that was only necessary if there's an expansion chamber in the block and I can't tell if that's the case or not. CKinnerley, is this modeled after the Mesa Tactical or the Cavalry Arms SS one? You're asking me? lulz. Well, according to the research I literally did just now based on the info you've given to me there, it's the Cavalry Manufacturing SST they've used as a design base. The Mesa Tactical adapter kit is a lot thinner and lower profile by comparison. I'm guessing the Cav made it a lot easier given that larger internal space to route the connection system from the cylinder to the gas parts in the shotgun. Link to post Share on other sites
Danke Posted March 26, 2014 Report Share Posted March 26, 2014 Buffer tubes are threaded. Really, really, really want. That and a better forend so no short shucking and we are gold! Link to post Share on other sites
PureSilver Posted March 26, 2014 Report Share Posted March 26, 2014 just to be clear, you guys are considering sealing a real steel buffer tube but then what? [...] If this is so, the only way to use the real buffer tube as the storage device is to figure out how to attach this interface at the front onto a real buffer tube, which doesn't sound easy at all[.] In addition, all AR15 buffer tubes have drain holes either at the bottom or at the very least at the end to drain water...any ideas about how to seal one? Yes, sealing a real steel buffer tube. You don't need to attach any interface to it; all that interface does is offer a QD valve to seal the individual canisters (the round silver tubes) to the adapter. The idea is evidently that you can switch out those canisters much like you can switch out the existing canisters in the existing stock. That QD valve just needs to be jammed open or removed altogether, as the RS buffer tube won't need to be QD, and the entire buffer tube pressurised. As for sealing drain holes, ten minutes' work with a TIG should resolve the problem, as would epoxy and a blanking plate. the way i see it, if they weren't optionally meant to be used without the buffer tube assembly, whats the point of making it into 3 pieces? why not make the buffer tube part of the stock adapter and have a larger buffer tube tank? they obviously wanted people to be able to install other buffer tubes and still have a gas source (even if severely limited). also, if the buffer tube tanks have their own fill valves, why bother putting a fill valve on top of the adapter? Like the others say, they're made in three pieces to make them easier to make, and to let you switch out the QD canisters much like you switch out the existing gas tanks supplied with the gun. The fill valve is there to make the gun easier to fill with gas; to fill it at the moment, you need to either fully collapse the stock and unscrew the canister and screw in a replacement (you may need to remove the stock to get a grip on the knurled end of the canister) or fully collapse the stock and refill the canister while it's still attached to the gun from a gas bottle, requiring you to hold the gun barrel down and jam a gas bottle into the end of the stock tube. Again, like the others say, the fill valve means you can refill the canister while it's still in the gun, which means you don't have to faff around with the stock. Sorry if I'm treading on your dreams, but there is simply no room in the adapter itself for a gas tank. Link to post Share on other sites
Horsem4n Posted March 27, 2014 Report Share Posted March 27, 2014 no dream treading, just thats the way it makes sense to me. its made on a CNC machine anyway, so i don't see how it would be easier to make the adapter and buffer tube separately or not other than to have another purpose. i also dont see how "faffing" around with a quick adjustable stock is any harder than positioning the gun in a way to fill it from the top. being that the former can be more easily done from a standing or kneeling position. but i digress, ill wait and see. Link to post Share on other sites
kagami Posted March 27, 2014 Report Share Posted March 27, 2014 mmm indeed, all this discussion is nice but I guess it's probably best to wait for the thing to come out. I definitely don't want to butcher my real M93 though since they're pretty rare, maybe someone is selling the STAR one somewhere still though. Link to post Share on other sites
uscmCorps Posted March 27, 2014 Report Share Posted March 27, 2014 The M93 is commonly available now that the rights have reverted back to Falcon/Ergo. They make the M93 but it's called the F93: http://ergogrips.net/products/stocks/ergo-f93-pro-stock.html Link to post Share on other sites
kagami Posted March 27, 2014 Report Share Posted March 27, 2014 its just not the same, they butchered the mounting system and made it horrible arfcom has them floating around in EE every once in a while, ill be sure to pick the next one up for this. Link to post Share on other sites
DrAlexanderTobacco Posted March 28, 2014 Report Share Posted March 28, 2014 Welp I'm ordering one. Link to post Share on other sites
FTZ-WildeCard Posted March 28, 2014 Report Share Posted March 28, 2014 Welp I'm ordering one. Thought you didn't have an 870? Or is this part of a new package you're putting together? Link to post Share on other sites
DrAlexanderTobacco Posted March 28, 2014 Report Share Posted March 28, 2014 Thought you didn't have an 870? Or is this part of a new package you're putting together? I'll order both Link to post Share on other sites
Bando Posted March 28, 2014 Report Share Posted March 28, 2014 I'll order both ditto Link to post Share on other sites
FTZ-WildeCard Posted March 28, 2014 Report Share Posted March 28, 2014 HAha so next time we go to the Mall we'd have gratudated from Glock Blockers to Shot Bros! Link to post Share on other sites
Bando Posted March 30, 2014 Report Share Posted March 30, 2014 damn right XD Link to post Share on other sites
sacairsoftsn00py Posted March 30, 2014 Report Share Posted March 30, 2014 Makes me regret selling my TM M870 ... Will definitely keep following this! Just get another one. Haha. I did Sent from my SGH-M919 using Tapatalk Link to post Share on other sites
swatti Posted April 2, 2014 Report Share Posted April 2, 2014 Gas in pistolgrip -version pls... And that supershorty kit. Is there a foldable grip like the Serbu has aviable? Link to post Share on other sites
DeltaZero Posted April 7, 2014 Report Share Posted April 7, 2014 Any more news on this? Any ideas of a release date? My M870 is finally in the UK I should be able to collect it tomorrow. My fingers are already itching! Link to post Share on other sites
christhesecond Posted April 8, 2014 Report Share Posted April 8, 2014 Gas in pistolgrip -version pls... And that supershorty kit. /\ /\ THIS!!! Link to post Share on other sites
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