Yankee Hill Machine Company Dust Cover Assembly Features The Yankee Hill Machine Company Dust Cover Assembly is marked 6.8 SPC so the chambering of the attached upper is identified at a glance which matters to any shooter who swaps uppers between range trips or hunts. Steel construction gives the cover the durability to stand up to repeated cycling and the heat and fouling that come out of the ejection port over a hard day of shooting. The caliber marking is cut directly into the part rather than printed on so the identification stays legible and does not wear off with handling or cleaning. This straightforward approach reflects Yankee Hill Machine s long history of building caliber marked upper receivers for exactly this kind of clarity. The assembly ships complete with everything needed for installation including the dust cover itself the hinge rod and the retaining clip spring so there is no need to source small parts separately. Fitting it is a simple swap on any standard AR-15 upper receiver making it a practical upgrade for a home builder or an armorer servicing several rifles. Because the cover is sized and shaped to factory specifications it closes and seats the same way the original piece did keeping the action protected from dirt and debris. For anyone managing more than one caliber on the same platform this marked dust cover is a small part that prevents a costly mix-up. Yankee Hill Machine Company Dust Cover Assembly Specifications Manufacturer: Yankee Hill Machine Company Model: Dust Cover Assembly Caliber: 6.8 SPC Material: Steel Fitment: AR-15 Upper Receivers Includes: Dust Cover Rod and Retaining Clip Spring Available At: GrabAGun