Hello. Look at the bottom of the linked page and read the part about twisting the firing pin to see if it turns (bad) or does not turn (good). Here's the link and I've copied part of the page. Hope this helps. John
www.wisnersinc.com/additionalinfo/winchesterl_88_100.htm
"Upon completion of the recall, the shops were to test fire the firearm and to stamp an assigned letter on the inside top of the receiver as seen thru the magazine well with the bolt retracted. The letter “B” represented Bolsa Gunsmithing, “L” was Lefever, and “N” was for Nu-line Guns. The letter “X” apparently was for all the other independent shops.
However this identification information did not get communicated to some of the smaller shops at the start of the project. The only way to tell if the gun as been modified, if the ”letter” is not present, is to take the barrel & action out of the stock, remove the trigger guard assembly and the try to rotate the firing pin by twisting it. If it does NOT rotate, then the firing pin recall HAS been performed." <<<===
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Also from the linked page:
"MODEL 100 DISASSEMBLY: The proper disassembly of the model 100 is to first remove the magazine, then remove the forearm screw AND the trigger guard screw behind the trigger guard. Now pull the operating handle all the way to the rear. While holding it to the rear, pivot the barrel unit up out of the stock. The rear of the receiver is held in place by it fitting in a notch in the recoil block in the stock. The reason that the operating handle has to be rearward is to allow enough clearance for the side rods from the handle to the gas cylinder unit to clear the slot in the forearm section. Since these rods are hidden in the forearm with wood covering them except when the handle is pulled all the way back. "
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