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Posted: 6/4/2025 10:22:22 PM EDT
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Has anyone put a M249 SAW clubfoot stock on an AR15 buffer tube? I realize it’s a DIY kinda thing but I’m currently trying to figure out the best way to slide the buffer tube inside the stock. There’s enough meat on the sidewalls of the SAW stock to get it in there, I’m just trying to figure out how to drill the hole big enough for a buffer tube to go in straight. So far I’ve cut the stock so it will be straight with the receiver and figured out how to mount the butt plate back on after everything is done. But can’t decide if I should just heat a rod of rebar up and force it through the plastic, or use a round file to slowly open it up, doubt a hand drill and drill bit will work. Figured maybe someone here has done it and will save me time replicating it before I dive deeper into spending hours on it. Once I can figure out the getting a hole big enough for a buffer tube, I’ll fill the voids in with some kind of epoxy mix.    |
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Have done something similar w/ Legos. You could just cut out all the interior reinforcement, cut it into small bits, plug the vent hole on the back of the buffer tube (important), and stuff the bits, buffer tube, and some lengths of threaded steel rod into the thing, then pour in 2-part epoxy. Looks like a fun project. ETA: are you sure that's going to be a sufficient LOP? Are you going to be able to tighten the castle nut? |
I sell firearms produced by the finest child labor in the world, be it Filipino, Muslim, Mormon, Arizonan, or Texan.
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Originally Posted By cmts58: Would be cool if the castle nut was retained in the stock, and you just spun it on Patent not pending The problem being if you can just spin it on, it can just spin off. You're relying on the buffer retention detent to keep the buffer tube from spinning off at that point. |
I sell firearms produced by the finest child labor in the world, be it Filipino, Muslim, Mormon, Arizonan, or Texan.
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Originally Posted By backbencher: The problem being if you can just spin it on, it can just spin off. You're relying on the buffer retention detent to keep the buffer tube from spinning off at that point. At the moment the idea is to spin it on and use a small window cutout on the stock to access the castle nut. I have an A1 on order to see if I can go that route too. The length of pull is equivalent to 4th position in a standard 6 position stock which I’m fine with since I’m using an Elcan. After I’m done I’ll definitely post some pics but gotta figure out the best way to get this hole exactly straight in relations to receiver so it’s not crooked when shooting. |
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Originally Posted By redman797: At the moment the idea is to spin it on and use a small window cutout on the stock to access the castle nut. I have an A1 on order to see if I can go that route too. The length of pull is equivalent to 4th position in a standard 6 position stock which I’m fine with since I’m using an Elcan. After I’m done I’ll definitely post some pics but gotta figure out the best way to get this hole exactly straight in relations to receiver so it’s not crooked when shooting. Originally Posted By redman797: Originally Posted By backbencher: The problem being if you can just spin it on, it can just spin off. You're relying on the buffer retention detent to keep the buffer tube from spinning off at that point. At the moment the idea is to spin it on and use a small window cutout on the stock to access the castle nut. I have an A1 on order to see if I can go that route too. The length of pull is equivalent to 4th position in a standard 6 position stock which I’m fine with since I’m using an Elcan. After I’m done I’ll definitely post some pics but gotta figure out the best way to get this hole exactly straight in relations to receiver so it’s not crooked when shooting. Given you need a goodly amount of torque on a castle nut to secure it before staking, a small window might not be enough. |
I sell firearms produced by the finest child labor in the world, be it Filipino, Muslim, Mormon, Arizonan, or Texan.
Apparently someone somewhere at some time made an adapter that fit an M249 stock to an AR lower, as seen in this video: Failed To Load Title Who made it? I haven't figured that out yet. But it appears to be discontinued. Perhaps someone here has one or knows who made the adapter? |
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Originally Posted By JsARCLIGHT: Apparently someone somewhere at some time made an adapter that fit an M249 stock to an AR lower, as seen in this video:  https://www.youtube.com/watch?v=5FmXsQBW9XkWho made it? I haven't figured that out yet. But it appears to be discontinued. Perhaps someone here has one or knows who made the adapter? I think the green entire stock in that video is 3D printed |
"An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." --Col. Jeff Cooper
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Originally Posted By Miles_Urbanus: I think the green entire stock in that video is 3D printed I'm talking about the other lower he briefly shows, which is a surplus M249 stock attached to a lower with some sort of adapter. You can see the head of a Spikes Tactical buffer in it. Someone asks him about it in the comments and his reply is only a cryptic "someone used to make them". |
| It looks like they cut off the angle change in the comb of the stock, most likely because it would have misaligned with the upper. And the way they squared off the adapter where it meets the upper appears to be a match for a Fightlite style upper, and it would probably match the profile on a Cryostructure receiver. |
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I mean it doesn’t need a crazy amount and if you’re super worried you can always locktite it. The green stock is cryostructures prototype. He has stated it’s his own design and will be making them for the dual feed lowers, but I’m not willing to wait for his quoted later this year (2025) or next year since there’s a lot of deadlines not being met by him etc… I decided the best way is probably fill the entire thing with resin or steel epoxy mix. Then I’m gonna square it to receiver and drill a hole big enough for an A1 or a standard carbine tube with some material off the bottom ground off to fit easier. |
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Here's a pic of the different M249 stocks. There's a 5th one, the Minimi stock, but it never had a buffer so I don't think it would work for this project. That's what's on my gun now. The two stocks on the right would be the easiest to convert to an AR-15 tube, since the profile is the same, just a different diameter. Stock 2nd from the right has a 1.138" diameter tube. Far right has a 1.25" diameter tube. For comparison, a mil spec AR-15 tube is 1.148 and commercial is 1.168 Tony  |
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Originally Posted By TonyRumore: Here's a pic of the different M249 stocks. There's a 5th one, the Minimi stock, but it never had a buffer so I don't think it would work for this project. That's what's on my gun now. Of all the professionals who might be interested in doing this, I had a strong feeling you'd be at the head of the line. Interested in making a prototype for me? Have a Lima Six coming for an article series on Ammoland/The Truth About Guns. Working on a Hilux roll bar mount right now too @tonyrumore |
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Yeah, I would be interested in that. We were planning on making a complete Lima 6 to M249 conversion kit, so your gun would look as similar to an M249 as possible. Just waiting on an upper. It's best to contact me via email at [email protected] to discuss this further, rather than try and hash it all out here. Tony Rumore Tromix |
Believe it or not I grabbed anairsoft M249 stock stock and it is pretty robust. For a range toy that I don't plan on buttstroking any RSO with, I think it will hold up fine. Originally Posted By TonyRumore: Yeah, I would be interested in that. We were planning on making a complete Lima 6 to M249 conversion kit, so your gun would look as similar to an M249 as possible. Just waiting on an upper. It's best to contact me via email at [email protected] to discuss this further, rather than try and hash it all out here. Tony Rumore Tromix @TonyRumore Well damn Tony. My FRTsaw won't be unique anymore  No but in all seriousness if you came out with a kit, I would 1000% grab one. |
"That pistol just kept saying, let go of my ears, you don't know what you're doing." - thehellbringer
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Originally Posted By cccpNyC: Believe it or not I grabbed anairsoft M249 stock stock and it is pretty robust. For a range toy that I don't plan on buttstroking any RSO with, I think it will hold up fine. Did it need any modifications? @cccpNyC |
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Originally Posted By withoutremorse42: Did it need any modifications? @cccpNyC Nop, it was made for a ar15 tube, so it went on easily. Makes me kick myself for buying a real one for $$$ and it just sits. 
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"That pistol just kept saying, let go of my ears, you don't know what you're doing." - thehellbringer
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Originally Posted By TonyRumore: Wow, that's cool. Did you do the front end work yourself? Tony @TonyRumore Sorry just saw this. So the work was done by @AlaskanCajun 's gunsmith up in Alaska. Airsoft m249 frame he sourced. The rest is all m249 parts. The rail holding it all together is a cheapo one no idea the brand.  
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"That pistol just kept saying, let go of my ears, you don't know what you're doing." - thehellbringer
Anyone wanting to use a real M249 stock. I found some standard things in the shop to make it work. 3/4" PVC pipe, cap, screw... put in drill... cut a slot .. insert sandpaper... sand till you remove about .010 M249 stock on AR15 A5 buffer tube  M249 stock on AR15 A5 buffer tube part 2 |
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