Might do a RIA MAPP instead of a FS BP6, both use small frame or cz mags to my understanding.
I can't speak to the quality/accuracy of the MAPP (maybe jwc007 will chime in regarding that) but what the RIA does have going for it is Lifetime Warranty on all Armscor guns.
Both of my RIA/Tanfoglio MAP1 (Steel) series pistols have been very accurate. To get them reliable I had to replace both the Magazines and the Extractor Springs. Now they reliably feed anything 9mm. Can't speak to the Polymer framed versions (MAPP1), but I would expect the same quality and issues. I would not mind getting the MS (mid-size) version of the MAPP1, although my SAR K2P is very similar in size.
Accuracy of Armscore/Tanfoglio MAP1 MS Accuracy with Match Reload at 50 feet.
Load uses Berry's 9mm 124 grain Plated Flat Point and WST powder
I imagine if they need the gun sent to them that ill be well and truly screwed because of the frame mods. The failure took place after the mods fwiw.
IF your mods were cosmetic in nature, I would hope that there would not be a problem with that. If functional and internal, I think you're out of luck. Care to describe or post pics of your work?
For the record, both my SAR B6P and SAR K2P have been very trouble free through about 1800 some odd rounds, now. I carried the SAR K2P for one Fall/Winter Season before I went to my Canik TP9. Can't speak to the SAR B6PC, but I would expect no less performance from one. The SAR K2P is issued to the Turkish Military.
EAA imported SAR B6P and K2P 9mm Pistols