Originally Posted by Viper Dude
Hello 22 boomer,
I have made some shortie triangular AR handguards from standard oldies. They were shortened from the rear with a chopsaw. The rear fitting was salvaged and belt sanded carefully to fit inside the new short section. It was bonded in place with JB Weld. Some black resin pigment was added to the JB Weld for cosmetics. A simple wood fixture was used to keep the fitting properly oriented until the glue cured hard via a hot lightbult. Surfaces to be glued should be rough sanded for good tooth and bonding.
Since that rear "fitting" is bonded to the inner surface of the shortened handguard halves that "fitting" must be carefully sanded down to fit. Aluminum heat shielding can be sliced away wth a Dremel and abrasive disc(s). Friends and I did this stuff about 27 years ago, before the internet and digital pics.
I had thought about doing just what you did. You may have given me the insentive to go ahead and try it. I had seen some carbine length triangle handguards for sale at one time but they were just cut down and an end cap made for the barrel nut end -- I didn't like that much. Thanks for the info Viper Dude!