won't stay closed

[grant ross]

My SBT opens up when fired it locks up tight with no play but opens up when shot??

[grant ross]

Parker SBT SC grade

[B. Dudley]

It is usually a bolt bite issue. Or a weak/broken top lever spring. But usually the bolt.

[grant ross]

thanks I'll contact previous owner and find out as much as I can about previous work etc

[grant ross]

forgot to ask what is the bolt bite

[Jeff Christie]

My SC does that on occasion with 3 dram 1 1/8 oz loads. My shoulder can’t stand a steady diet of 3 dram shells so I am delaying getting it fixed. I load very light 3/4 or 7/8 oz. Loads and never have an issue. Score is not a big issue with me but comfort and pain is.

[Frank Good]

I assume an SBT "wear plate" is something along the same lines as the locking plate in something like a 101, Citori etc. and not shaped like the locking block in my Perazzi's?

[Researcher]

Parker bolting from a 1930 catalog.

Bolting from the 1930 Parker Bros. catalog.jpeg

The fit of the replaceable "bolt plate" is critical as well as the strength of the top-lever spring.

[Jim P.]

This may sound crazy, Grant, but my 1929 SC opens after every round when shooting Winchester 1145fps #8 shells BUT NEVER opens using Remington 1145 or 1100 #8 shells and never opened using RST shells when they were available. I have no idea why and shoot the Remington shells exclusively. I do not "snap" the gun shut - I release the lever before closing it tight. Good luck - these are great guns!

[J. Scott Hanes]

Do you put grease on the wear plate?