Pro-Arms CNC Aluminum Threaded Outer Barrel for SIG Sauer ProForce P320 M17 MHS Airsoft GBB Pistols

"Appears to be a very good replacement barrel for the junky barrel that comes with the Proforce P320/M17.

You will have to drive out the pin and remove that tiny spring that holds the hopup chamber and inner barrel. Be warned that the pin is in there very tight and you will need a small punch, needle nose pliers and a hammer to get it out. Take your time doing it.

Material build appears to be of much better quality than the original barrel and after just a few magazines worth the BB's is holding up quite well.

My only complaint is that it does not come with a thread protector. However, I had no difficulty applying my various thread protectors for 14mm Negative threads. Looks good on the pistol as well.

This is a very good replacement for an item that should have come with a much better outer barrel in the first place and is highly recommended.