Modified Magazines

CST Modified Magazines:

The CST Auto Bolt Stop works by a lengthened ejector/lever relaying directly on the cartridge rim. If there is no cartridge rim present, then the bolt gets stopped. This simple concept requires a clearance cut in the magazine to expose the cartridge rim.

All CST Modified Magazines are completely disassembled and rebuilt in 6 steps:

  1.  If the magazine is customer supplied, it gets inspected and completely cleaned.
  2.  The magazine throat has the necessary clearance cut CNC machined in place and then it is completely deburred and polished.
  3.  A clearance cut is also cut in the rear plastic plate and then it is completely deburred, including the common burrs left from the factory underneath the hex nut.
  4.  The socket head screw is carefully turned in a lathe and 100% inspected for correct height. It is then deburred and reblued.
  5.  The magazine body is stamped to identify it as an authentic CST Modified Magazine.
  6.  Each magazine is then reassembled with the correct spring tension on the follower (2 to 2 1/2 turns) and properly snugged for reliable function.

Unmodified magazines will not work with the original (1st Generation) CST Auto Bolt Stop. Without the necessary clearance cut in the rear of the magazine mouth, the bolt stop mechanism will be put in a bind and will not allow forward movement of the bolt, rendering the rifle inoperable. This can also lead to damage to the auto bolt stop mechanism. All CST modified magazines are completely compatible with factory 10/22 rifles, with or without the auto bolt stop installed. Although a modified magazine is supplied in each Auto Bolt Stop Kit, CST also offers extra magazines for $22.75 and are available online.

 

?The relief cut needed for ABS use

?The relief cut needed for ABS use

?The CST Mark on a modified magizine

?The CST Mark on a modified magizine

Aftermarket 10/22 Magazines:

Several attempts to modify aftermarket magazines were all found to produce unsatisfactory results. Most companies have departed from the steel throat configuration that Ruger uses with their rotary magazines. This usually orients the cartridge incorrectly and creates incorrect geometry for the auto bolt stop device to work properly. High capacity aftermarket magazines yield a greater range of spring pressure on the cartridges from fully loaded to the last few rounds making proper function of the auto bolt stop device problematic. Also keep in mind that some aftermarket magazines function unreliably right out of the box.