Extar EP9 Mil-Spec Buffer Tube Adapter

thingiverse

**WARNING: DO NOT USE THE FACTORY EXTAR EP9 BUFFER!!! THE PLASTIC TIP ON THE BUFFER WILL SHATTER!!!** I can't stress that enough. I put 50 rounds through mine before it shattered. The stock buffer has a plastic "tail", and if you use it in an aluminum mil-spec tube, that tail will shatter, causing the EP9 to recoil harder than normal. If you decide to run this adapter, I highly suggest picking up a different 9mm buffer. The stock buffer is 6oz & 4" long, so an aftermarket buffer with those dimensions will work. Also, the STL is in inches, so you'll either have to import it in inches, or just scale it to 2540%. I also highly suggest printing this in something strong, like Nylon, or Carbon filled Nylon. I printed it in ABS with 100% infill and it has held up alright so far, but Nylon would be a better choice. Now, on to the deets; **To preface this, this adapter is for the newer version of the EP9. The older version has a buffer tube retention ring that actually clamps onto the tube, whereas the new one has the retention ring that just slides over the buffer tube and is held in place with the single 1/4" bolt. This adapter might work for the older version, but I don't have one to verify if it dose or not.** Now, I'm not a fan of the non-easily-adjustable SOB pistol brace that comes standard on the EP9. I'd much rather use an SBA3/4, but due to Extar's quest to make the EP series as proprietary as possible, I had to design this adapter to accept a mil-spec buffer tube. I'm also not big on how the stock tube attaches either. You'd think that having a single anchor point below the tube wouldn't be the strongest method. That is why I also designed the piece that replaces the upper receiver cover. The new piece encompasses and sandwiches the "nub" on the top of the lower receiver and the main adapter clamps down on to that. This gives the adapter two anchor points to the lower receiver, instead of just the one. [Here is an imgur album of the installation instructions.](https://imgur.com/a/I37ZYwU) Pay no attention the crappy print quality. My printer isn't that great, so I'm having someone with a good printer print me one out of Carbon filled Nylon. Note: You'll need (2) 4mm x 15mm socket cap machine screws & (2) 4mm nuts to assemble the pieces. You could also put a few drops of super glue, or Rocksett, on to the buffer tube if need be. Disclaimer: Use this adapter at your own risk. I'm not responsible if someone launches their bolt, buffer, buffer spring, and buffer tube behind them at the range if they start running pissin' hot +p+++ handloads though their EP9.