The extractor is cut out from 3mm steel plate and retained using a 3mm pin with a small spring providing tension. Once the bolt piece is finished it can be pinned inside the carrier using four m8 grub screws or steel bars along each side allowing any needed adjustments prior to optionally welding it in place. When assembled the bolt weighs almost g. If further weight is desired, a section of steel sheet can be welded to the inside of the carrier offering a convenient container for filling with more material and sealing with weld.
The cocking handle is made from an m10 bolt threaded into place, optionally modified in diameter using a ring of 19mm x 1. The trigger group is a very simple arrangement which allows the bolt to move forward under spring pressure when the trigger is pulled or stay cocked back behind the sear when the trigger is released.
Both components are cut from 10mm thick aluminum easier to cut or steel plate. The contact surface of the sear is provided by way of an m8 bolt tapped into place which is then filed to it's correct shape. Compression springs which are ideal for use can usually be found by opening up the pump of a hand sanitizer or shampoo bottle.
A suitable recoil spring can be obtained from a lever type grease gun. The compression spring inside may need to weakened by heating slightly and rapidly slamming to acquire the right amount of tension or by cutting off a number of coils. The spring used here measures 6. Finishing High temperature engine enamel type sprays offer a very durable means of finishing each component and require little preparation and usually no priming.
If used on aluminum, most spray finishes will not bond as reliably as they will on steel. Anodizing or parkarization may be employed if a higher quality finish is desired. Plans All pages included should be printed out on 8. Each component template is drawn to scale and can be cut out and glued to their respective thickness of material or used as reference for measurements. Make sure the ruler at the bottom left of each sheet is 2 inches in length. Alternatively, take a screen-shot and enlarge the plans using a computer program until the ruler is the correct length, then trace the parts needed onto a sheet of paper taped over your computer's screen.
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Sign up Log in. Web icon An illustration of a computer application window Wayback Machine Texts icon An illustration of an open book. Books Video icon An illustration of two cells of a film strip. Video Audio icon An illustration of an audio speaker. Audio Software icon An illustration of a 3. The Ingram "MAC 10" is a blowback-operated, selective-fire submachine gun that fires from an open bolt.
The Cocking handle is located at the top of the gun receiver and can be used to lock the bolt in forward position by turning the cocking handle by 90 degrees. It does not move with the bolt when firing. The folding shoulder stock telescopes from the receiver and is made from made of steel.
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