I like gas pipe joint tape. Basically 2" wide electrical tape that's 10mils thick. One layer does the trick. Also holds up well in blast cabinets when doing finishing work
Built a 10mm 1911 on a Les Baer frame I have had for 20+ years waiting for inspiration. When it was time for my son to pick his first handgun he immediately said build me a 10 on the Baer! Great pistol. Baer slide, Novak low mount fixed sights, Kart non-ramped barrel(Delta elite style) egw stop...