I recently bought a witness standard steel in wonder finish. I swapped out the guide rod for the Hennings cone fit and a wolf 20 lbs recoil spring. I took it to the range today and fired 150 rounds of Armscor and 20 of Underwood 165 grain. No issues other than shoots way low just like my witness PS 9 did before swapping the rear sight out. One odd thing was that I could easily put 14 rounds of the armscor in the magazine but only could put 13 of the Underwood in. Anyone else have the same experience?

If you need, Grams Engineering has follower/spring kits that accomplish that.

www.gramsengineering.com/

They were good folks to do business with.

Greg

I don't think the magazine spring is any issue, no ftf or anything else other than I can't fit as many Underwood's as Armscors in the same magazine. I wouldn't think there would be any size differences between the two rounds so just wanted to know if anyone else has the same experience.

I have no issues with either.  The Gram follower is designed without the legs of the standard K10 follower.  I currently have 15 rounds in the magazine for a 15+1 capacity.

Greg

Thanks. I went to their site and they had no tanfoglio items available.

Try henning shop.