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SRU Bullpup Conversion. EDIT: Got one! Build starting. (Page 2 of 2)
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Originally Posted By 80085: I had one a long time ago. They’re boat anchors. Originally Posted By 80085: Originally Posted By Nickel_Plated: Combine this with one of those AR-57 uppers and it might make a neat "P90 we have at home" https://ar-57center.com/wp-content/uploads/2023/01/main-qimg-456c568124e20e4ea0353d9774934822.png I had one a long time ago. They’re boat anchors. Mine ran fine - even on my ersatz lower made from a trigger jig & thumbhole stock. |
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Originally Posted By Flonominal1: That looks great, it's been about a month, any issues? How's it holding up? Still running strong. I’ve had zero issues with it even though I chopped it up a bit for my setup. I moved my Geissele 2-stage into it and it’s amazing. I really like the feel and handling. Aside from the buffer system (which is rarely a point of failure) it’s all AR so I’m considering switching to the long config making this my primary. A little more shaving and it will accommodate an LMT MRP monolithic upper assembly which will provide better optics stability. Probably run a 12.5” barrel out of it for ballistics. |
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Didn’t see this thread so I also started one. Really liking mine so far. Attached File |
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Originally Posted By bluedog82: Didn’t see this thread so I also started one. Really liking mine so far. https://www.ar15.com/media/mediaFiles/499242/IMG_8991_jpeg-3535144.JPG Mechanically these rely on some weird operating system adjustments - that basically make it not really an AR15 system anymore. And historically have had more spotty reliability - at least by some accounts. How about yours? Round-count and jam rate? |
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Originally Posted By lazyengineer: Mechanically these rely on some weird operating system adjustments - that basically make it not really an AR15 system anymore. And historically have had more spotty reliability - at least by some accounts. How about yours? Round-count and jam rate? Mine runs the Dead Foot Arms recoil system and it runs like a raped ape, especially with the FRT!  That system is just a chopped down M16 BCG with a dual spring setup (included 6 springs so you can fine tune it for 5.56 up to .50 Beowulf). Aside from that, it's all standard AR15. |
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Originally Posted By lazyengineer: Mechanically these rely on some weird operating system adjustments - that basically make it not really an AR15 system anymore. And historically have had more spotty reliability - at least by some accounts. How about yours? Round-count and jam rate? Only 40rds in, no jams yet. The ARIC can be picky about what uppers and lowers it likes, though, regardless of the chassis. |
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Originally Posted By bluedog82: Didn’t see this thread so I also started one. Really liking mine so far. https://www.ar15.com/media/mediaFiles/499242/IMG_8991_jpeg-3535144.JPG How is your zero holding? The thing that worries me about these bullpup kits is having the optic mounted on the handguard. I'm going to try to mitigate some of that issue with a PRI 3 screw riser and a Daniel Defense quadrail. |
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Originally Posted By WyattC: How is your zero holding? The thing that worries me about these bullpup kits is having the optic mounted on the handguard. I'm going to try to mitigate some of that issue with a PRI 3 screw riser and a Daniel Defense quadrail. I’ll have to check. Accuracy was not great during zeroing (probably 3-4MOA with M193), using an Armalite SS 16” bbl. I think it’s pretty easy to also put pressure on the rail system, not even mentioning the optic mounted to the rail itself. |
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Moved to an11.25” FM15 upper. I notched the upper’s handguard so I could slide the SRU extended handguard into it. I could not get the FRT to run reliably with the Deadfoot buffer system, so negated my reason for running a milspec upper. 
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Originally Posted By Thor: Mine runs the Dead Foot Arms recoil system and it runs like a raped ape, especially with the FRT! That system is just a chopped down M16 BCG with a dual spring setup (included 6 springs so you can fine tune it for 5.56 up to .50 Beowulf). Aside from that, it's all standard AR15. Originally Posted By Thor: Originally Posted By lazyengineer: Mechanically these rely on some weird operating system adjustments - that basically make it not really an AR15 system anymore. And historically have had more spotty reliability - at least by some accounts. How about yours? Round-count and jam rate? Mine runs the Dead Foot Arms recoil system and it runs like a raped ape, especially with the FRT! That system is just a chopped down M16 BCG with a dual spring setup (included 6 springs so you can fine tune it for 5.56 up to .50 Beowulf). Aside from that, it's all standard AR15. Hey Bluedog, Is see you are running the Dead foot system. Simple question, do you need the Dead foot buffer tube and the backplate to use the MCS springs and buffer? I just got my SRU chassis and the instructions are not cleared if the supplied buffer tube and end cap will work with the MCS. I am trying to figure out if running without that center post in the MCS system is a good idea or not. I am still waiting for Dead Foot to send my order. |
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Originally Posted By AR18: Hey Bluedog, Is see you are running the Dead foot system. Simple question, do you need the Dead foot buffer tube and the backplate to use the MCS springs and buffer? I just got my SRU chassis and the instructions are not cleared if the supplied buffer tube and end cap will work with the MCS. I am trying to figure out if running without that center post in the MCS system is a good idea or not. I am still waiting for Dead Foot to send my order. @AR18 You need to use the deadfoot tube with the SRU back plate. The tube that comes with the SRU kit isn’t compatible with deadfoot. I confirmed all this back when I ordered because I was hoping I could just buy the Deadfoot bolt carrier and springs to save myself some money. SRU told me their buffer tube is only for use with the buffer less uppers and the LAW recoil system… though the ladder requires a little modification still. If Deadfoot is out of stock and you can cancel your order, I am actually selling my MCS25 kit as I’m switching to a JAKL upper. |
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Now sporting a 10.5 JAKL upper with a super safety and the AS Designs JAKL trip kit. I am very tempted to chop my barrel down an inch to reduce the supressor gap just because of asthetics.  Since it's shorter I had to move the optic forward...so I have room for a magnifier now. I also need a real light. My Inforce doesn't fit anymore since I'm not using the extended rail. More money to spend! 
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Originally Posted By AR18: Hey Bluedog, Is see you are running the Dead foot system. Simple question, do you need the Dead foot buffer tube and the backplate to use the MCS springs and buffer? I just got my SRU chassis and the instructions are not cleared if the supplied buffer tube and end cap will work with the MCS. I am trying to figure out if running without that center post in the MCS system is a good idea or not. I am still waiting for Dead Foot to send my order. I think Thor answered your question; mine is the LAW version FYI. |
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Originally Posted By bluedog82: I think Thor answered your question; mine is the LAW version FYI. Originally Posted By bluedog82: Originally Posted By AR18: Hey Bluedog, Is see you are running the Dead foot system. Simple question, do you need the Dead foot buffer tube and the backplate to use the MCS springs and buffer? I just got my SRU chassis and the instructions are not cleared if the supplied buffer tube and end cap will work with the MCS. I am trying to figure out if running without that center post in the MCS system is a good idea or not. I am still waiting for Dead Foot to send my order. I think Thor answered your question; mine is the LAW version FYI. He did. I confused your guys' posts who had which system. I order the missing items from Deadfoot and I am just waiting for those parts to arrive. Here is the mock up so far. 
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Got the AS designs trip kit in! Also decided to Cerakote the chassis, lower, and suppressor FDE. July 29, 2025 |
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Originally Posted By Thor: Got the AS designs trip kit in! Also decided to Cerakote the chassis, lower, and suppressor FDE.  https://www.youtube.com/watch?v=HA13TgCA9bAJust saw that posted on their IG. Nice! |
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SRU Bullpup Conversion. EDIT: Got one! Build starting. (Page 2 of 2)
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