A windowed Glock 43/43X slide assembly, built in-house at 3CR Tactical - machined from 416 stainless, finished in salt-bath black nitride, with the RMSc footprint cut directly into the slide and a cover plate installed. The lightening window cuts reciprocating mass and shows the barrel through the top of the slide. Assembled with a crown-cut black nitride barrel, standard-height polymer sights, and the full 3CR Tactical slide completion kit. What's included Windowed slide, RMSc optic cut, black nitride over 416 stainless Optic cover plate, installed 9mm crown-cut black nitride barrel Standard-height polymer sights, installed 3CR Tactical slide completion kit - striker, extractor, safety and recoil assembly What you'll need to supply An RMSc-footprint optic, if you want one - the cover plate ships installed so it runs iron-sight-only until then A completed Glock 43 or 43X lower This is a slide assembly, not a complete pistol. Fitment - Glock 43 and Glock 43X, and third-party frames built to the same pattern. The optic cut is the RMSc footprint (Shield RMSc, Holosun 507K/407K, Sig Romeo Zero and similar). Optic screws are 6-32. Build it complete: this slide is also sold as a slide + frame parts kit combo - the same slide paired with the 3CR Tactical frame parts kit, bundled for less than buying the two separately. DISCLAIMER: GLOCK is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.m.b.H. Neither 3CR Tactical nor this site are affiliated with, or endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of "GLOCK" on this page is merely to advertise the sale of aftermarket GLOCK pistol components. For genuine GLOCK, Inc. products, visit www.glock.com.