Bought a Krink M92 rifle, with the "Long" flash hider, and the manufacturer did not include the spring loaded retaining pin in the FSB to hold the pinned and welded compliance flash hider.

Seeing that I want to make this an SBR, is reinstalling the pin and spring assembly any problem, IE, can it be done without taking the FSB off the barrel, I know it seems silly to ask, but I thought at one point, I had read that it must be done with the site base off.

Thanks in advance.