I had an AR rifle buffer I wasn't using anymore since I don't have a rifle stock on either lower. I ground and filed the shoulder on it flat with the adjoining area, as in the top of the first pic, right of center. I ground and filed the flared end, far right, slightly larger than that, so it just fit in the stock tube of the VRF14. Then I wrapped friction tape on the other end, right up to the edge where the rubber tip meets the metal. I actually had too much tape and took off about 3 layers, a layer at a time, until it was a very snug fit. I started the buffer into the tube, and covered it with Amazing Goop between the tape and the other end. It fit so tightly, I had to hammer it in the last 2 inches because I couldn't push it in by hand. The end of the buffer is ~1/8" from the end of the tube. I used a Birchwood Casey flat black paint pen to cover the end of the buffer. It looks like I missed a spot but I didn't.
I don't know if the moving weights in the buffer will do anything to help with recoil, but the extra weight will. I balanced the empty gun on the edge of a wooden ruler, and the balance point seems to be ~1/4" forward of the front of the mag well. A loaded mag should move the balance point right into the mag. Now there's a VRF-14 LONG with a stock and 20" barrel. It's made in the U.S.A. and the MSRP is only $358. That's even cheaper than the VR60 shotgun made in Turkey that the VRF14 is based on. You know I'll be getting one. It looks like it only comes with 1 mag, but that will be a total of 10 that I have for both guns.
PS. I have an M16A4 carry handle I can put on the shotgun, but no matching front sight. I'll have to buy one if I use the carry handle.
P.P.S. The VRF14 Long takes interchangeable stocks, meaning it can take a side-folding adaptor, like my VRF14.