Y4140 chrome moly steel, heat-treated, black phosphate. 0.500 inches from top rail to inside radius of lower ring; sei 30 mm hd rings med; the set consists of 2 matching retainer, gun components which makes one complete installation.
No other part numbers with same form, fit, and function found.
NSN 6620-01-633-8443
NSN 5996-01-269-0982
NSN 7035-01-532-8077
NSN 5905-00-143-0943
NSN 6150-00-288-6245
NSN 5945-01-119-1352
NSN 6620-01-426-2220
NSN 5920-00-043-1425
NSN 6645-00-960-6594
NSN 6320-01-335-8336
NSN 4140-00-314-1025
NSN 5855-01-503-0144