If you look closely, you can see that my new Model 81 has these grooves. These grooves are unique to FBI model 81's. This apparently was done by request of the FBI because the barrel jacket head was being shot loose by heavy use. The chief distinguishing feature of a late FBI model 81 and a non-FBI model 81 is grooves put in the barrel jacket that were used to induction braze the barrel jacket to the barrel jacket head. The "late" type FBI model 81's had regular barrel mounted sights and the receiver markings were in the usual configuration. You can see that my new Model 81 has the receiver markings of the early FBI model and those markings are unique to the early FBI model. The FBI requested the change because the Lyman 41 sight covered the serial number when the markings were in the usual configuration. I have a "civilian", non-FBI Model 81 that displays the usual receiver markings. The "early" type had the Lyman 41 sight, no rear barrel sight, a high front sight blade and the "Remington" logo and serial number moved over and "stacked" under the Model name ("Woodsmaster") ![]() This is one of the oddities of this appears to have both the features of the early and late FBI rifles. There are two types of FBI Model 81's.an "early" type and a "late" type. ![]() ![]() Did the FBI guns have a rear barrel sight ?
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