Semiautomatic or automatic gun

A gun comprising:

• a receiver element having a barrel extending forwardly from said receiver element, said barrel having a chamber end and a discharge end;
• a handle element attached to said receiver element and a trigger assembly integrated with said handle element;
• said receiver element having a bolt carrier chamber formed therein and a bolt carrier assembly slidably disposed in said bolt carrier chamber;
• said bolt carrier chamber at a rearward portion thereof and said bolt carrier assembly defining a gas chamber;
• a bolt assembly slidably disposed in said bolt carrier assembly;
• an actuator slidably engaged with said receiver element and said actuator engagable with said bolt carrier assembly and said bolt assembly;
• a firing pin assembly slidably disposed in said bolt assembly and having a firing assembly in communication with said trigger assembly;
• a receiver cap at the rearward end of said receiver element;
• a gas pressure adjustment assembly having a rod threadably engaged with said receiver cap having a centrally disposed opening therein;
• an adjustment disc slidably disposed in said receiver element and having a disc aperture defined therein for slidable engagement with said rod;
• said gas pressure adjustment assembly having a rod retainer slot for receipt of a rod retainer screw to retain said rod for rotational motion of said rod;
• said gas pressure adjustment assembly having a rod slot;
• said gas pressure adjustment system having a plurality of locking lugs at an open end thereof;
• said handle element having an annular adjustment slot defined therein wherein there are a plurality of lug openings define for receipt of said locking lugs;
• a lug release lever in said handle element having a protrusion for closure of one of said lug openings;
• and
• an ammunition source attachable to said receiver element.

A gas pressure adjustment system for use with a gas operated recoil machine comprising:

• a receiver element having a chamber formed therein and a piston slidably disposed in said chamber;
• said chamber at a rearward portion thereof and said piston defining a gas chamber;
• a receiver cap at the rearward end of said receiver element;
• a gas pressure adjustment assembly having a rod threadably engaged with said receiver cap having a centrally disposed opening therein;
• an adjustment disc slidably disposed in said receiver element and having a disc aperture defined therein far slidable engagement with said rod;
• said gas pressure adjustment assembly having a rod retainer slot for receipt of a rod retainer screw to retain said rod for rotational motion of said rod;
• said gas pressure adjustment assembly having a rod slot;
• said gas pressure adjustment system having a plurality of locking lugs at an open end thereof;
• a handle element having an annular adjustment slot defined therein wherein there are a plurality of lug openings defined for receipt of said locking lugs;
• and
• a lug release lever in said handle element having a protrusion for closure of one of said lug openings.