Professor Parabellum - The Box Tube MAC-11 by Practical Scrap Metal Small Arms Volume 2. 2-Professor Parabellum

Author:Practical Scrap Metal Small Arms Volume 2. 2-Professor Parabellum
Format: epub

Bolt For legal purposes, the bolt on the demonstration model was made without provisions for a firing pin and can only feed dummy inert rounds. Rather than milling a bolt from a single block of steel, it is constructed by inserting a length of 16mm round or square steel bar into a length of 20mm steel square box section with a wall thickness of 2mm, the same material used for the barrel collar. The breech face of the bolt piece is first drilled 3mm deep using a 10mm drill bit and then levelled flat using the same size drill bit with it's tip removed. The feeding cuts for the magazine are formed using an angle grinder fitted with a 2mm or 3mm grinding disc after which it is hand finished using a file. The ejector slot is cut using a 1mm slitting disc until the ejector itself slides in and out without resistance. The finished 'dummy' bolt is retained in place using a number of steel rods, grub screws or beheaded bolts threaded in place. Additional weight can be added by drilling out and inserting tungsten bars or partially filling the back of the bolt with lead. To ensure positive engagement with the sear, the contact point at the front of the bolt carrier can be increased in width using a welder and then filed to shape.

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