11/16/2002 12:56:13 AM When using ARMS 39 with M4 handguards, you can file the top of the handguard with a simple flat file. It takes more time than using a dremel, but it leaves a nice flat surface. It is also harder to ruin your handguards with a file than with a dremel. I used a thick business card to measure the clearance between the ARMS 39 and the M4 handguard, but you may want to leave more. You will also have to either remove or bend the brushbreaker to make it fit right. By the way, I am using the Aimpoint extra wide, extra tall, picatinny mount. It co-witnesses the Aimpoint Comp ML2/M2 pretty well. I’ve also heard the ARMS 22m68 is a great mount. Good luck. Chuck