I have 2 14.5 colt gov profile barrels, I assume they’re takeoffs from either police or military rifles. Both have good shiny bores. The odd part is that they are already dimpled for what looks like Midwest industries gas blocks. Like the ones in the link
Midwest Industries, Inc.
Average Rating: 5
Price: USD 50.95
Low Profile Gas Block
The AR-15 Low Profile Gas Block is constructed from 4140 steel and has a low profile design that will fit under most commercially available handguards. Made by Midwest Industries. Shop All AR Upper Parts & Receivers.Average Rating: 5
Price: USD 50.95