This drop-in A4 upper will attach to virtually any standard AR-15 lower receiver. Comes complete with dual flip rear sight in a removable carry handle, charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly. With a 1 in 9" twist, the 16" chrome lined barrel provides outstanding accuracy that has been enjoyed by competition shooters worldwide. Pre-ban style upper includes a bayonet lug and flash hider. Also features a removable carry handle turning the upper into a versatile flat top for mounting optical devices or accessories.
AR-15 Hammer and Trigger Pin Dimensions:
Some Colt® AR type rifles have been manufactured with hammer and trigger pins and holes which are approximately
.176" in diameter. These are referred to as "large pin" Colts. This was done to eliminate the chances of someone putting M16
fire control parts into an AR receiver. This is not found in all Colt models, just some.
All other AR type rifle manufacturers have stayed with the .156" diameter hammer and trigger pins and holes, or "small pin"
which is the same spec used in all military M16 rifles.
Measure your pins or the holes in your lower receiver to determine if you have a "small" or "large" hole Colt® AR
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