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					In 1938, Colt introduced a .22 LR caliber conversion unit to 
					convert the Colt Government Model .45 and military 
					variations of the same gun to .22 LR.  This unit utilized a 
					patented "floating chamber" to simulate the recoil of a .45 
					that was designed by David "Carbine" Williams.  A big 
					selling point was that the shooter could use this unit for 
					target practice and the cost was approximately 1/7th that of 
					target practice with .45 caliber ammunition. In 1939, the retail cost of this unit was 
					$34.00.  The small walnut display case for the conversion 
					unit was available for an additional $3.50 and the large 
					walnut box for holding both the .22-.45 conversion unit and 
					wither the Government Model or National Match was $7.50. |