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I would like your opinion and feedback on these USC aftermarket picatinny rails. Do they hold up well and how are they compared to HK factory ones? How much weight do they add to the USC?
Thanks in advance, guys!
HK UMP & USC Picatinny Rail Set - HKPARTS.NET
Thanks in advance, guys!
HK UMP & USC Picatinny Rail Set - HKPARTS.NET
