I bought a heavy barrel 22-250 combo rifle a few years back, just before the accu-trigger came out. My .300 WSM with accutrigger shoots like a dream, but that 22-250 is horrible. The trigger is so heavy and rough, that I can't hold it on target even on sandbags when I squeeze. Can an accu-trigger be retro fit to my older gun, or do I have to replace it?