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A 4.3 won't have the same issue as 5.1's rearsight though, as it is not a adjustable sight which have IMO reduced strength. And much like the Glock or USP all you need to replace is slide and barrel then upgrade the recoil spring and you have a full metal gun. Besides, there are plenty of Hi-Capas outthere that have been FMU and have had thousands of rounds through it with propane and had no issues with wear. Mine have had at least 2-3000 rounds through it and the wear is minimum at the barrel lug. SD's slide are pretty tough as they are 7075, which as far as aluminum goes is about as tough as they come.
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