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alanint · 10-09-2013, 01:30 AM

You really should not be swapping a .30 cal. lower with a 9mm upper, unless you change recoil springs as well. The 9mm is more powerful than the 30 cal. and the weaker .30 cal. spring will cause malfunctions and possible damage to your pistol.

10-09-2013, 01:30 AM	#8
alanint User Join Date: Mar 2008 Location: Marco Island, Florida Posts: 4,867 Thanks: 1,685 Thanked 1,917 Times in 1,193 Posts	You really should not be swapping a .30 cal. lower with a 9mm upper, unless you change recoil springs as well. The 9mm is more powerful than the 30 cal. and the weaker .30 cal. spring will cause malfunctions and possible damage to your pistol.