S.F.S.
Good question. The two piece piston assembly worked fine for years except for one thing. The MORONS! You might be surprised at how many 1100s and 11-87s are brought to gunsmiths with functioning problems because the piston was installed wrong. Of course, instructions are in the manual and most guns
I have seen have a label on the gun showing the correct way to install the piston parts, but many people can't be bothered to look.
By the way, there is a good point in the instructions that is often over-looked. Be sure that the slots on the piston and piston seal DO NOT line up. If they are lined up, it shouldn't be to difficult to understand that a lot of gas will leak past the and piston cause functioning problems.
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Experience is what you get when you were expecting something else.
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