No drilling, tapping or major alteration. Guaranteed to hold zero. Can be removed and reinstalled easily. Includes 1" fully machined, horizontally split scope rings and is windage adjustable. Replaces rear sight. If using high rings no bolt grinding is required. Made in the USA of top grade military allan aircraft aluminum.

Instructions for installation of the 1903-A3 Springfield
 
The simple attractive and efficient design of this mount makes it ideal for the shooter who desires a fine mount but has little means with which to alter his firearm to accept a scope. To attach this base, proceed as follows:

1.    Disassemble the firearm, removing the barrel and action from the stock.

2.    Remove the bolt from the gun.

3.    You do not have to remove the front sight, just the rear sight.

4.    Install the special split receiver band on the receiver, forward of the recoil lug. Install 6-40 screw and tighten.

5.    Place the Insta-mount with dovetail portion of base against male dovetail on receiver. Locate the base evenly on the rear portion of the receiver so it is not offset to either side. Now place
      Dovetail clamp in place at rear of base and tighten securely with 5/8 long flat head screw.

6.    Place the other 5/8 long flat head screw into the countersunk hole on front of Insta-Mount and thread it into the receiver band. Before reassembly of your Springfield, some simple modifications of your stock may be in order. Some inletting may be necessary under the receiver band area in your stock particularly where the band is screwed together. A Drumel tool works good for this. As the upperhand – guard will not be used, set this, with bands, aside or you can shorten the forearm of your stock. Do this by cutting off just forward of the band retaining clip on the right side of the forearm. Trim to suit your needs.  

7.   Install your scope on the gun before you replace the bolt. If the rear lens of your scope is not more than 1 ½ inches in diameter, you should be able to use your original bolt with the high rings provided. The safe also can be used without modifications with the high rings. If the rear scope lens is larger you may need to alter the safe & bolt. When grinding your bolt handle be sure to allow enough clearance that the BOLT WILL NOT TOUCH THE SCOPE UNDER ANY CONDITION. If you find it necessary to replace your bolt with an altered one, be sure to have a competent gunsmith check the head-space.