Jig is machined to the exact dimensions of the inside of the receiver. It can be used with either the 9mm or the versions. It can also be used to bend the back plate in the correct location. Correctly aligning the parts and holding everything together while welding is the two hardest part of any build, this jig helps make that easier. It will work with all receivers as long as they are made to original specs and can be used multiple times. Each jig comes with all the necessary hardware to install the jig for standard SMG and semi-auto.
Though wipes are less durable than reflex baffles, they had the advantage of proving quieter for the MAC The suppressor is mm in length and is covered with Nomex -A heat-resistant material. These sights are for use with the folding stock, as using them without the stock is nearly useless because of the initial jump of the weapon due to its heavy, open-bolt design. The MA1 also has two safety features which are also found on the Model 10A1. The charging handle rotates to 90 degrees to lock the bolt in the forward position thus preventing the weapon from being cocked. The second safety is a slider which is pushed forward to lock the trigger, which in turn pins the bolt to the rear cocked position. This prevents the weapon from discharging even when dropped, which is not uncommon with an open-bolt design.