I would like to replace the recoil spring on my M1 with a stronger one. Brownells carries a "Recoil Spring, Heavy" for this gun and claims that is a Benelli original part # 60481. Also Wolff Gunsprings, carry one for this model shotgun that they call "BENELLI RECOIL SPRING - 25% extra power". Does anyone have any experience with either one of these springs. Thanks