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This is the 3rd time you've asked that same exact question, you could contact iver johnson to see what their stance is on it

Shaun, no I did not. I don't shoot these power levels regularly, just for hunting and the heavier recoil spring helps a great deal to lessen frame battering. I happen to have some 1800fps 135gr Nosler JHP and 1650fps 155gr Gold dots using a 6 inch barrel in my Glock 20 with a 22lb recoil spring.