Crosman 1077 power upgrade. Thanks again for your service and awesome products Apr 10, 2012 ยท But what makes it work great is that the c02 cart has the compression and the volume to reap some horsepower benefit from a heavier spring. Got it from Ramman at Canadian Shooting supply. You'll be shooting with ease. 9gr Crosman Premier Pointed pellets, but I feel that my particular 1077 lacked the power and consistency in accuracy to make clean kills at distances over 10yds. Gets close to 600 fps . Crosman 1077 Powerlet Conversion Adapter Kit The aftermarket parts fit well enough, or can be modified to work. The sights and targets help level up your shooting skills. The adapter was designed exclusively for the Crosman 1077, but it has been reported that it is also compatible with the Crosman 2100 and Legacy 1000. IF the 2100 will not dump all the air, it can benefit from a heavier hammer, as the valve will have a longer dwell time. Enhance the performance of your 1077 CO2 air rifle. pw1r jqiv 90u l8d xw gstcw ahehqpl aexg yc qhami