These are original military surplus Yugoslavian Zastava YUGO M70B1 Bulged Front Trunnion.  De-milled from military M70B1 service rifles. Very good surplus condition.
 
ALL PARTS MUST BE INSTALLED BY A QUILIFIED GUNSMITH.
 
⚠ WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.