HK45 Standard Barrel - HK 45 Full Sizehttps://www.hkparts.net/shop/pc/HK45...-418p14564.htmPrice: $279.95Thread Protector HK45, H45C, USP .45 & USPC .45 - Titaniumhttps://www.hkparts.net/shop/pc/Thre...-418p17942.htmPrice: $24.95HK45 Threaded Barrel - Threaded Barrel .578 X 28 - UShttps://www.hkparts.net/shop/pc/HK45...-418p17446.htmPrice: $239.95Thread Protector HK45, H45C, USP .45 & USPC .45 - Steel 16 X 1 LHhttps://www.hkparts.net/shop/pc/Thre...-418p18004.htmPrice: $19.95