The drill is coated in Do-Drill cutting oil. A hardened steel insert is used to guide the drill bit. ![]() The drill hits the wood, instead of the inside of the bore when it breaks through. A dowel is inserted into the shotgun’s bore to protect it during the drilling process. I used blue tape to mark where I wanted to drill the holes. The drilling guide is secured to the barrel using clamps. I used tape to mark the beginning and end of where I wanted the ports. The barrel is secured in the vise using the plastic jaws provided in the kit. A 23 hole per side kit (kit #2) is also available, this uses a #31 drill bit (.120″).īefore you begin, I would highly suggest stocking up on a supply of drill bits to replace the bits you may dull or break. The supplied bushing guides a #40 drill bit (.098″). ![]() The kit we used (kit #1) has a drilling fixture with 35 holes on each side. To port your own barrel, you just need to supply the drill. The porting kit includes a set of vise blocks to secure the barrel, an aluminum drilling fixture, a hardened drill guide and a drill bit. and its authors,do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. The contents of are produced for informational purposes only and should be performed by competent gunsmiths only. I ordered the following items from Brownells: This is a quick and easy project that requires minimum tooling. I decided to port the 18.5″ barrel on my 870 Remington shotgun. Porting a shotgun helps decrease muzzle rise and felt recoil.
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