Six spacers have been included with your BAR ShortTrac or LongTrac rifle. These spacers fit between the buttstock and receiver, allowing adjustments to the drop at comb, heel and cast on/off. Each spacer is labeled/stamped for what each does. One of these six spacers, the neutral spacer (No. 2), is already installed on your rifle.
DROP AT COMB AND HEEL:
Adjusting the drop at the comb allows you to align your eye perfectly with a scope. The drop measurement of the comb is determined by measuring the distance between the axis of the bore and the forward most point of the comb. The drop at heel is determined by measuring the distance between the axis of the bore and the top end of the buttstock or recoil pad. Spacers labeled 1, 2, and 3 adjust drop at comb and heel. They do not give any cast on/off adjustment. The stock remains straight. These spacers with their respective stamps are identified here:
1 Raises the comb approximately W, and heel approximately W.
2 Neutral. This spacer is already installed on your BAR rifle. It sets drop at comb at 5/s", and heel at W.
3 Lowers the comb approximately W, and heel approximately W.
CAST ON AND CAST OFF:
Adjusting cast on and cast off allows you to achieve a perfect fit from the stock to your face. This is a most crucial adjustment, as it determines how correctly and consistently your eye will line up with a scope. Some right-hand shooters like the stock to bend away (cast off) from the face, while many left-handed shooters prefer a bend to the left (cast on). A rifle correctly adjusted for cast on and cast off will have you looking directly into the scope. You will notice that the two opposing edges of spacers marked 1R 1L, 2R 2L, and 3R 3L differ in thickness. In addition to adjusting the cast on/off to the right or left approximately VS" per spacer, spacers marked 1R 1L, 2R 2L, and 3R 3L, will also adjust the drop at comb and heel the same amount as spacers 1, 2, and 3. Cast on/off spacers, with their respective stamps are further clarified here:
1RL This spacer raises the comb approximately W and the heel approximately VS" and will also adjust the cast on or off approximately VS". For right-handed shooters, install this spacer with the R facing out, toward the end of the buttstock, so its thicker side is on the left side of the receiver. This casts the stock slightly to the right, away from the face of a right-handed shooter. Turn the spacer around so the L is facing out and it will cast the stock to the left.
2RL This spacer adds VS" cast to the stock and the same amount of drop (lVi") to the comb as spacer No. 2 (neutral spacer).
3RL This spacer adds VS" of cast to the stock and lowers the comb approximately W and heel approximately VS".
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