Steelhead

Yes, the CZ FPB spring is compressed during the trigger stroke while the Tanfo spring is relaxed. Trying a heavier spring has been on my list of stuff to try (albeit fairly low). Yup, the way the Tanfo FPB spring antagonizes the sear spring is pretty clever. I toyed around with that heavier spring idea as well but I haven't been able to find a spring small enough to fit in the FPB block and yet strong enough to make a difference on the trigger pull.

People blame the short main spring design for the stacking but I think that it contributes relatively little to it. I fact if you remove the sear assembly and pull the trigger while holding the disco down with your finger you'll push the hammer all the way back with almost no stacking, even with stock mainspring. The stacking mostly comes from the internal geometry of the sear assembly, trigger bar and disconnector and is made worst when you have a heavy mainspring pushing back on the disconnector. A lighter mainspring and a good polish - especially of the disco/trigger bar and disco/frame interface doesn't eliminate the stacking but make's it light enough that a good progressive squeeze gets me a very nice double action surprise break on my stock 3. I didn't get any light strikes with the 13 lbs spring, but I still went with the longer Extreme pin-block firing pin, just in case.

I see that you've cut some CZ rubber grip panels to fit on your Tanfo frame. Did you have to cut through the metal core underneath the textured rubber to clear the built-in magwell or was there enough room at the end to be able to just cut the rubber?

IMHO stacking is much less noticeable with a 14 or 13 lbs mainspring. As Nealio points out, you might have to cut a coil or 2 off some Wolff springs - the 13 lbs ones are especially long.

Aftermarket mags are legal in production (appendix D4 17.1). The problem is that stock 9mm CZ mags are to short to fit in Tanfoglio guns, at least it is the case for my stock3. Tanfo 9mm mags fit great great in CZ shadow however, as long as you dont mind a small gap between the base plate and the magwell.

I've been shooting a new Stock III S.E. in parallel with my trusted 2 yr old CZ SP01 Shadow for 2 months now. 3k rounds between the 2 guns later, I still haven't found a clear winner yet so I kinda have to agree with conclusion of the review. Also here in Canada we have great distributor support behind both brands, so that's not a factor. I ran bench rest sessions with no difference in groups and various offhand timed drills at anywhere from 5 to 25 yards and could not on an objective basis give an overall edge to either guns. Both guns have been eating a steady diet of mixed brass reloads without a single failure (as in 0), operator induced or otherwise, so excellent reliability on both sides of the aisle. Out of the box the Stock III trigger is just OK, which comes as a disappointment given that it is more expensive of the 2 guns. However it it improves a lot after a good polish/deburr, and the infamous DA stacking becomes much less noticeable with a lighter mainspring ( I agree 100% with Neatio, some Wolf main springs need to be cut or else you're pushing against a solid steel tube if the coils are touching). Also I had to swap the Tanfo iron front sight for a fiber dot. Fiber is standard on the SP01 Shadow. The CZ is shooter right out of the box, and a fantastic value for the money, so if that's you main criteria... well there you go! As for the Tanfo, I paid more $ for the Stock III SE and had to spend a few hours polishing/deburring and messing around with springs just to make it as good as the CZ. On the flip side the Nickel finished Special Edition Stock III is a hot piece of holster candy, so guess which one is most likely to be at my hip at the next local IPSC match? No one said it had to be fair.

Hello all, Recently developed an IPSC addiction that's eating a chunk out of my hunting and fly fishing schedule. I have a foot on either side of the border and mostly shoot food in the US and cardboard in Canada (I know ,I'm doin' it wrong!) but looking forward to shoot some matches in VT in 2014.