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FSB pinning

FSB pinning




We align and pin an F marked (or if specified a non-F marked for fixed carry handle receiver builds) A1 or A2 front sight base to a barrel using MIL-STD 2/0 taper pins. Service includes a FSB complete with A2 style iron sight assembly and riveted sling loop. Hand guard cap, barrel nut, and delta ring assembly purchased separately.

Got something to discuss?

Andrew Matthews
4 years 4 months ago

Perfect job! Even provided a nice FSB. Thanks again for the excellent work, fast turnaround, and great price

3 years 6 months ago

The build I am doing requires the fsb to not have the sling loop, can that be modified for the order?

3 years 6 months ago

Hi Colton,

Sure you can just add to the order notes at checkout that you don’t want the sling swivel and we’ll make sure it gets built without it. Thanks. Sorry the WarBlock Barrel Builder is currently down and not taking orders, also the website in general is being a little tweaky, but we’re working on it and hopefully it will be back up soon. Thanks!