Configurable blowback bolt system
View Patent ↗A configurable blowback bolt system is provided. Embodiments include a two-part configurable bolt assembly having a bolt carrier and a configurable bolt that allows for use with various calibers of ammunition, both rifle and pistol. The configurable bolt may also eject cartridges to the right or left side of the rifle by moving the extractor to one or the other side of the bolt. A buffer may be included as part of the configurable blowback bolt to shorten the stroke based on the caliber of ammunition being fired with the configurable blowback bolt system.
1. A configurable bolt assembly, comprising:
a bolt carrier, the bolt carrier further comprising:
a rear portion; and
a front portion, the front portion further comprising:
an opening for receiving a bolt therein; and
a longitudinal slot through the top thereof;
an interchangeable blowback bolt, coupled within the opening of the bolt carrier such that a longitudinal boss extending upward from the interchangeable blowback bolt extends upward through the longitudinal slot in the top of the bolt carrier, wherein the bolt is interchangeable with other interchangeable blowback bolts of different configurations to accommodate pistol and rifle cartridges of different lengths and different calibers;
a lateral aperture through the bolt carrier;
a lateral aperture through the bolt, wherein the lateral aperture through the bolt is aligned with the lateral aperture through the bolt carrier;
an aperture that extends downward through the longitudinal boss of the bolt and into the lateral aperture of the bolt; and
a connecting pin inserted through the lateral aperture of the bolt carrier and through the lateral aperture of the bolt; and
a cone-point set screw threaded into the threaded aperture, the cone-point set screw engaging the connecting pin, thereby pressing the connecting pin and the bolt carrier forward while pressing the cone-point set screw and the bolt backward such that a forward-facing bearing surface of the bolt carrier is pressed tightly against a back surface of the bolt to secure the bolt to the bolt carrier.
2. The configurable bolt assembly of claim 1 , comprising:
a firing pin through hole disposed longitudinally through the bolt for receiving a firing pin therethrough, wherein the firing pin through hole does not extend through the rear portion of the bolt carrier.
3. The configurable bolt assembly of claim 1 , wherein a cup of the interchangeable bolt further comprises:
a first extractor recess, having a first extractor spring recess therein, on a first side of a cup of the bolt;
a second extractor recess, having a second extractor spring recess therein, on a second side of the cup;
a first ejector groove on a side of the bolt opposite the first extractor recess; and
a second ejector groove on the side of the bolt opposite the second extractor recess, wherein the bolt is symmetrical with respect to a longitudinal vertical plane through the longitudinal axis thereof, wherein the bolt may be used to eject spent cartridges either to the right or to the left of a firearm by installing an extractor and extractor spring either into the first extractor recess and first extractor spring recess, respectively, or, into the second extractor recess and second extractor spring recess, respectively.
4. The configurable bolt assembly of claim 1 , further comprising:
a cub-point set screw threaded into the threaded aperture and tightened against the cone-point set screw to prevent the cone-point set screw from loosening.