Kudos to Numrich

[SakoL61R]

Numrich for the win. I get many parts from them and they never fail to impress with order processing and delivery times. Placed the order Wednesday and Santa arrived late yesterday.
Citori receiver rebuild after it was acting up last weekend.
Got up early and had it done before breakfast.
12 ga function checks we’re perfect this afternoon. Tubed it up and shot some .410 to verify the inertia blocks for the final. All good now.
Set for next weekend!

 

[Clemson]

Good job! Inertia triggers are tricky!

 

[Offroadtek]

Good work. I've used them a few times over the years with some older gun parts. Never had a bad experience with them.

 

[SakoL61R]

Good job! Inertia triggers are tricky!

Thanks!
Of note as this might help others:
Browning Citori, 12 Ga, purchase new in 1987. Skeetmaster tube set. Zero issues until this after untold 1000's through it in all four gauges and field use. Along with regular cleaning, I also cleaned the inside of the receiver depending on yearly use, but never took it apart.

Initial problem a few weeks ago was that the gun would not fire the upper barrel after the lower was shot. However, lower would fire after upper was shot.

I took the receiver apart and thoroughly cleaned/inspected it, noting the parts that appeared to have wear, checking springs, etc.
Back together and the gun double fired with a single trigger pull.

Replaced:
Both firing pins and (lower) spring
Ejector trip rods
Both mainsprings (the new were slightly longer than the old)
Both sear springs.
Both hammer pins.

Had new hammers and sears, but the old ones checked out ok, so didn't replace them.
Took a couple very minor burrs off the inertia blocks/mechanism as well.
Suspect the main culprit was weak main and sear springs.

Always enjoyable to figure out how things work and fix problems. I'm no trained gunsmith, just been doing it since Daddy caught me with my 20 ga, Rem 870 all apart many decades ago. (He was/is a Gunsmith...)

<<<12/18 Update: 100 .410 and 300 12 ga. Perfect function except for..... the shooter.