This is my new factory correct HK53 built by TSC Machine with all HK53 parts & a HK93 reciever. The build is 100% perfect from the finish to the headspace. Mike & Tammy at TSC are a class act when it comes to HK builds & running a business. (Very friendly & professional). THANKS MIKE & TAMMY FOR THE BEST BUILD EXPERIENCE I HAVE EVER HAD!