Brownells - Jack Rowe, Master Gunsmith Series, Bore Size and Proofing, Part 5 of 6

This video details the critical process of measuring shotgun barrel wall thickness, a key factor in determining a firearm's safety for modern proofing. Instructor Jack Rowe emphasizes a minimum acceptable thickness of 20,000ths of an inch, with 25,000ths being preferable. He also explains how to interpret proof marks, distinguishing between black powder and nitro proofing, and highlights historical practices that could lead to thinner barrels.

This entry details the examination of a Walther PPK lacking standard proof marks. The speaker, a hobbyist, suggests this could indicate it was never issued, possibly due to factory completion at war's end, refinishing, or being a 'Lunchbox Special' – a firearm smuggled from the factory by an employee. The PPK in question is dated 1934.

This guide details the examination of a rare Walther PP pistol featuring a unique 'Shark Fin' grip extension. It covers the analysis of its construction, potential purpose as a prototype or custom modification, and the interpretation of its historical markings and dating. The information is presented with the authority of a recognized expert in collectible firearms.

This guide details how to approach and understand mystery Walther PPK contracts from WW2, drawing on expert analysis of serial numbers, proof marks, and production variations. It emphasizes comparing these unique firearms to known models and considering historical context for potential identification. The information is presented with the authority of an experienced collector and researcher of German military sidearms.

This guide details a thorough basic inspection process for British side-by-side shotguns, emphasizing checks for deferred maintenance and hidden issues. It covers barrel condition, proof mark verification for chamber length, rib integrity, bore measurements, action tightness, trigger pull assessment, and ejection mechanism functionality. The inspection is presented by experienced gunsmiths to ensure a firearm is safe and sound before purchase or further work.

This guide details how to examine Walther PPK pistols assembled by American GIs from parts found at the factory at the end of WWII. It covers identifying key features such as caliber, slide finish, frame material, and the significant absence of standard markings, highlighting these as characteristics of late-war, non-standard production. The information is presented with the authority of a recognized expert in historical firearms.

This guide details the installation of a Geissele MK8 Super Modular Rail on an AR-15 platform. It covers securing the upper receiver, installing the barrel nut, gas system, and the rail itself, emphasizing the use of specialized tools and proper torque specifications. The process requires an intermediate skill level and careful attention to detail for a secure and functional build.

This guide, based on expert instruction from Brownells, details essential practices for proper ammunition storage. It emphasizes using airtight containers, managing humidity with desiccants, and maintaining stable temperatures to ensure ammunition reliability and safety. Proper storage is crucial for preventing corrosion and propellant degradation, especially for sensitive components like primers.

This guide details the process of upgrading an AR-15 from standard A2 furniture to Magpul components. It covers the removal of the A2 pistol grip and installation of the Magpul MIAD Grip and Magpul PRS Stock. The video demonstrates efficient assembly using specialized tools, highlighting the ergonomic benefits and adjustability of the Magpul parts. Instruction is provided by Brownells, a recognized industry authority.

This entry details the creation of a movie prop suppressor for a Remington 11-87 used in 'No Country for Old Men.' Prop master Larry Zanoff explains how the suppressor was designed to look homemade and was non-functional, with sound effects added in post-production. The process highlights the creative problem-solving involved in film armory.