Original CST 10/22 Auto Bolt Stop
The patented CST Auto Bolt Stop debuted as the world’s only last shot bolt hold open device available for the Ruger 10/22 rifle. It is designed to automatically stop the forward travel of the bolt upon its full retraction if and when there is an absence of another cartridge. Upon the discharge and ejection of the last round loaded in the rifle, the auto-bolt stop mechanism will detect the absence of a fresh cartridge and automatically stop the bolt’s forward travel upon an empty chamber. To load the rifle with the bolt locked open, insert a loaded CST modified magazine (supplied in the kit) and simply pull rearward the bolt and let go. The cartridge present in the magazine will trip the auto-bolt stop mechanism and allow the bolt to carry the cartridge forward into the chamber. The auto-bolt stop tab located next to the magazine latch is designed to manually release the bolt from a locked position. Manual bolt stop release is primarily needed to close the bolt on an empty chamber or can be used to clear a jam during a firing session. To use the manual release function you should pull back on the bolt to relieve tension on the bolt stop, and then push forward the auto-bolt stop tab, and while holding the tab forward, release the bolt.
To unload the rifle, remove the magazine and pull back the bolt until it automatically stops in an open position. This will clear the chamber of a live round and lock the bolt open, exposing an empty chamber. Some tight chambered match barrels may not extract a live cartridge.
The CST Automatic Bolt Stop is fully compatible with most aftermarket products for the Ruger 10/22 rifle, including magazine latches, triggers, sears, hammers, etc. MOST IMPORTANTLY, FOR THE 1ST GENERATION AUTO-BOLT STOP MECHANISM TO FUNCTION CORRECTLY ONLY CST MODIFIED MAGAZINES CAN BE USED.
CST Auto Bolt Stop Return Policy:
Custom Shooting Technologies, Inc. guarantees the Auto Bolt Stop and Modified Magazines to be free of defects for a lifetime of use. For any reason a customer becomes unhappy with our products, simply return the item for a full refund.
However, any damage to the 10/22 auto bolt stop caused by using any other magazine other than CST modified magazines voids this lifetime warranty. All CST modified magazines have been identified with “CST MOD MAG” clearly stamped on the bottom of each magazine.
Notice:
Ruger 10/22 rifles serial number prefix 351-xxxxx and newer us a MIM manufactured bolt that no longer have the correct relief cut necessary for proper function of the CST Auto Bolt Stop. Due to this change to the bolt, an inadequate surface to interface with the auto bolt stop mechanism will exist and can only be corrected by modifying the bolt and creating the proper relief cut.
?MIM Manufactured bolt on left; bolt with correct relief cut on right.
To address this issue, CST, Inc. has worked closely with Power Custom, Inc. to develop an improved system to provide a last shot bolt hold open function for 10/22 firearms. CST 2nd Generation Auto Bolt Stops are now available for use with the Power Match 10/22 bolt, which replaces the mass produced MIM factory bolt. This system requires the Power Match Bolt but does NOT require modified magazines and will function with the new Ruger BX-25 high capacity magazine.