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Posted: 8/5/2010 7:24:12 AM EDT
| What is the time frame on 603 upper colt proof marks no forge codes and NO REBATE front lug? |
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Quoted:
1971 M16A1 round forging no forge code black or gray lugs no counter bore on front pivot lug Colt proof marked gray/blue anodizing standard A1 port door matching slip ring C and Bell FSB with flash milled off front and back C MP C barrel bird cage flash suppressor modern gas tube handguards have drain holes in the heat shields and are marked L & R |
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