Base Kit: any 1/72 P-47D Thunderbolt
Master Model is a company that makes turned brass aftermarket parts, specifically pitot tubes, refueling probes, gun barrels, and antennas.
The first thing I would like to point out is how good the packaging and instruction sheet are. The packaging consists of a zip-lock type bag while the part is in a smaller bag, keeping it from moving all over and getting lost as you work. The instruction sheet is very clear and easy to understand, detailing a mere 3 steps. Cut off original part, drill a hole (0.8 mm), glue in the new metal part. Just be careful drilling the hole, especially in 1/72. The bottom of the sheet has a 1/72 scale template of the barrel spacing on the wing. I just laid the wing down over it and adjusted the distance as I glued the barrels in with CA.
When compared to the kit part, there is no comparison. The kit gun barrels look like thick sticks of plastic, while the Master Model parts are a complete work of art with drilled-out barrels. Once you use a couple of Master Model’s pieces, you will be completely spoiled and never want to use the kit gun barrels again.