A percussion lock is much less finicky than a flinter, so buy one for style. Siler, Chambers Siler, L&R, others from days gone by, you can't go very wrong with a percussion lock. If you will use double-set triggers get one with a fly in the tumbler. Flintlocks are a very different deal as design, geometry and proper hardness of the parts are critical for sending a good shower of sparks reliably into the pan. I have never purchased a flintlock that did not need tuning to satisfy me, and I have bought a Siler from the pre-Chambers days, 4 L&R flintlocks, 2 Davis flintlocks and a Chambers flintlock. Some needed more work than others. My latest acquisition, a Chembers Germanic (Christians Spring) just needed honing/lapping of the tumbler shank, hole, and the bridle where the tumbler axle rotates in it. 5 minutes and slick as an eel, feels smooth as silk when cocking it, sear releases cleanly, and sends loud sparks into the pan.