It sometimes takes effort to convert a production caliber pistol to what was once a fully wildcat cartridge. Such has been the effort with my Glock Model 21SF and its conversion to the 460 Rowland cartridge. The Rowland is a higher pressure version of the venerable 45 ACP with 1/16th inch longer case loaded to the same overall length as the 45 ACP. With a cartridge in the chamber, the loaded Model 21 in 460 Rowland holds 14 rounds, as it does in 45 ACP. If an attacker continues to move towards you after receiving 4 or 5 solid hits with the 460 Rowland, you have been attacked by a super-human or an attacker hopped up on crack, LSD, or some other illegal substance. With America being America by the way, such an attacker is not entirely uncommon.
My solution for the Glock 21SF was a DPMS managed recoil system that utilizes two stiff springs within a rod assembly that fits within a larger hollow rod over which yet another spring rides. This setup came with two springs, one of 16 pounds of resistance. I replaced this with an 18 lb. Wolff spring. The outer spring by the way is not captured and causes you to have to use considerable force and guidance to place the front of the spring over the front hole of the Glock slide while feeding the outer rod into the recoil rod hole. All-in-all its not a bad deal. I had rather deal with this than try to fit the original 24 lb. spring over the recoil rod and thread a retaining screw in the end of the rod.
At the range, the now overall higher resistance of the recoil system near the end of the stroke of the slide along with careful technique provides reliable reset of the trigger. My self and several law enforcement officers have now fired almost 500 rounds through the Rowland converted Glock with no failure to feed, to extract, or to reset the trigger. In fact, several of the officers are looking at the conversion for personal carry as the performance and shootability with the recoil system from DPMS along with the compensator makes for a very convincing system when facing urban — and now days suburban — predators of the two legged variety.