- #MAC 10 UPPER REPLACEMENT FULL#
- #MAC 10 UPPER REPLACEMENT MODS#
- #MAC 10 UPPER REPLACEMENT PLUS#
- #MAC 10 UPPER REPLACEMENT FREE#
As it is a blowback, the extractor is largely unnecessary as gas pressure pushed the case from the chamber. The 10mm, a long cartridge like the 9mm, feeds beautifully from the grease guns magazines due to its length and the length of the feed lips of the Magazines. Notice distance to chamber mouth from magazine.
#MAC 10 UPPER REPLACEMENT MODS#
This is weapon before mods to feed ramp and chamber. Once the extractor clipped the case rim, it stayed tight till the ejector kicked it free.
#MAC 10 UPPER REPLACEMENT FULL#
By gently notching the barrel just enough to clear the extractor, I got full case support as well as never having the extractor “ride up” on the barrel at all. In the MAC-10 system, the bolt both encloses the cartridge as well as supports it from the rear.
#MAC 10 UPPER REPLACEMENT PLUS#
Massive bolt addition used to harness the 10mm in blowbackĪ custom barrel in 10mm with exact modifications necessary to adapt it to the MAC-10 upper receiver plus some special fitting gave me the support the cartridge needed to work effectively. Also gone is the horrible “front strap” which gives every owner nightmares of shooting his own hand. MPA already has modified the weapon for side cocking on the left side (which is good for both Left and Right handed operators) freeing up the upper part of the receiver to use with a rail for sight mounting. The Lage fore-end allows for a two handed grip much like a rifle, completely changing the “personality” of this weapon. While the bolt addition slows cycling, it also increases dwell time, allowing a higher pressure cartridge to fire its bullet and pressures to safely drop before extracting the case. Lage makes the bolt addition as a way of reducing the high cycle rate of the full auto MAC-10, not a concern of ours but a fortuitous development. The fore-end was a piece from Lage Machinery, who makes a nice fore-grip setup for the MAC-10 as well as massive bolt addition by Lage to increase bolt mass. a fore-grip, a flattop rail for optics mounting that attached to the upper receiver with a barrel rigidly screwed into the upper receiver making them one piece, a bolt massive enough to take the 10mm as a blowback, a simple buttstock that folded but was strong enough to be used as a CQB weapon and would also allow firing of the weapon while folded). I turned it into a carbine by adding only those items needed to scale the design (i.e. The receiver I chose is the modern version of the Mac-10 produced by Masterpiece Arms. 45 machine pistol and scaled it up based on Pressure, while retaining its massive and simple internals designed to handle a larger cartridge. Rather than scaling down a rifle (the usual approach) or attempting to bring a modern 9mm design upward I selected a. Therefore a radical redesign to incorporate an unnecessary but advanced mechanism was completely eliminated.Īfter looking at well over 30 successful designs ranging from the English Sten gun to the Russian PPs43 to the American AR-15 9mm clones (which can be found in both gas operated and recoil operated versions) to the Thompson gun to the Israel UZI to the Ruger 44 mag carbine, I found the best design of all. In fact the first designs were shown to be venting too much gas, as the barrel was actually being depressed on each shot by the action of the gas. For example the KRISS system could have been incorporated into the design, but slow motion studies showed that a simple muzzle brake could reduce muzzle rise to zero. The Max-10 Katana is designed around the cartridge and to be a carbine above all, using the best available design features as well as throwing away those that are unnecessary. While the KRISS or the MP-9 are designs with innovations, they were designed as pistols first with added capabilities. One of the criticisms of this project was that I was “reinventing the wheel” rather than coming up with something new like the Swiss KRISS or the Brugger & Thomet MP-9.
#MAC 10 UPPER REPLACEMENT FREE#
While all had advantages, the blowback design is the most robust, using simple physics of its massive bolt to contain the cartridge for just enough time to allow the bullet to exit the barrel before pulling cartridge free of the chamber. Several excellent designs exist for reliable subguns, ranging from complex locking recoil designs to gas operated and buffered designs to simple blowback designs. The lower receiver acts as a container that holds the various important parts of the firing mechanism (hammer to strike the firing pin (if applicable), the Bolt bolt (to provide a temporary wedge to the end of the barrel during firing a recoil spring mechanism to slow the bolt an ejector so that the cartridge will be ejected and a fresh cartridge fed smoothly into the chamber to be fired, repeating the cycle. The basic design of the receivers for this weapon are here:
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