MNT-640TRIII New Gen. SKS Tri-Rail
Receiver Cover Mount 
Installation Guide
 
Caution: Make sure the firearm is not loaded. Remove or open magazine and examine chamber. Use safe handling procedures at all times. 
 

1. Locate the receiver cover of your SKS rifle. Pull out the locking pin. Carefully and gently lift and remove the existing receiver cover. Do not pull too quickly which may result in sudden release of the bolt operating spring. Refer to Figure 1.
 
2. Loosen the 4 Set Screws on the mount with a flat screw driver. Make sure they are loosened enough so that they do not stick out through the holes.  (Figure 2)
 
3. The receiver cover mount is made intentionally longer than the original receiver cover. Gently file the front two prongs of the mount if they are too long for your SKS receiver. DO NOT over file. Maintain the prong angle to ensure a good snug fit. (Figure 3)
 
4. Place the mount in a vice with padded jaws for protection. Bend each of the front prongs very slightly as shown in Figure 4. This will allow a snug fit of the cover both vertically and horizontally, and improve shooting accuracy.
 
5. Slide the scope mount onto the receiver cover. Press it forward and down until the front prongs are inserted into the receiver completely. (Figure 5)
 
6. Align the Locking Pin with the pin hole at the rear of the scope mount. Drive the locking pin back into the receiver using your finger or gently tapping it with a rubber mallet until the pin is flush with the receiver surface at the opposite end. Then, turn the locking pin handle forward to secure a tight lock.  Due to different rifle variants, the rear pin hole area may need minor filing for best fit. (Figure 6)
 
7. Tighten the 4 Set Screw and the nuts. (Figure 7)
 
8. Test drive  the bolt carrier and check its movement under the receiver cover mount to ensure that there is no interference to the bolt operation, If there is any interference, DO NOT use until it is resolved.  Your scope mount is now fully seated and fitted into the receiver and is ready for scope installation.
 
 
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November 20, 2009 06:47:47 EDT