2. UNLIMITED RIFLE. Any rifle having a barrel 18 or more inches long, measured from the face of the bolt to the muzzle, and having a safely operated firing mechanism. For minimum barrel length the legal method of measurement from the face of the bolt shall be employed.

 3. HEAVY VARMINT RIFLE. Any rifle having a safe manually and mechanically operated firing mechanism, weighting not more than 13½ pounds inclusive of sight. With a stock having a flat or convexed forearm and total stock width not more than 3", having a toe formed by an acute angle not greater than that formed by a straight line drawn from the toe of a substantially vertical butt starting at a point at least 4" below the axis of the bore and extending forward to the bottom of the barrel at a point 18" forward of the bolt face. A barrel not less than 18" long, a diameter at and not more than 5" ahead of the bolt face of not more than 1.250" and a diameter at any point between the muzzle and a point 5" ahead of the bolt face not grater than would be defined by a straight taper between such point 5" in front of the bolt face at 1.250" diameter and the muzzle at .900" diameter at 29".

 The barrel may be attached to the receiver, bedding blocks or sleeve or combination thereof for a distance of no more than four inches, measured from the face of the bolt. The overall length of the receiver, bedding blocks or sleeve or combination thereof not to exceed fourteen inches. (Maximum dimensions shall not include normal scope blocks and sight bases.)

 4. LIGHT VARMINT RIFLE. Any rifle of not more than 10½ pounds in weight inclusive of sights and otherwise meeting the requirements of the Heavy Varmint Rifle.

 5. SPORTER RIFLE. Any rifle otherwise meeting the requirements of the Light Varmint Rifle, but of not less than .23 caliber.

 6. OTHER RIFLES. Safe firearms, not qualifying under the definition of various classes set out herein, may be fired in any tournament provided the shooter and the competitors be informed that he is not eligible for any awards, records, prizes or place in the aggregate, and provided that the range facilities are conveniently available, and the shooter pays the usual registration fee and fills out a registration card.

 Should any person develop any rifle, and or, equipment that does not meet existing rules and classifications, he may submit the rifle or equipment to the Directors for evaluation and approval or disapproval.

 7. MANUALLY AND MECHANICALLY ACTUATED FIRING MECHANISM. This phrase shall include an electric trigger, with an arming feature that is manually operated. All components must be within the rifle. The use of pressure fluid or remote actuation is not allowed. This paragraph applicable to the 10½ and 13½ classes, but excluding the Hunter Class.

 8. CLUB. An Affiliated Club as defined in the By-laws of this Association, who owns, leases, or controls a range with the specifications suitable for holding a Registered Bench Rest Tournament may be a Club.

 9. RANGE FOR REGISTERED TOURNAMENTS. A place to shoot having not less than 5 benches on a firing line; it shall have sturdy target frames at measured distances from the firing line not less than 100 yards, preferably at 100 and 200 yards, and desirably at 100, 200, and 300 yards; the target frames shall be served with moving backer strips or cards; the bullet stop shall be adequate to stop bullets of any caliber and shall be sufficiently high to intercept ricochets.

10. FIRING LINE. The firing line shall preferably be coincident with the forward edge of the bench, but if it is to the rear of that line, then it shall be marked conspicuously on the bench.

11. TOURNAMENT. An orderly program of competitive shooting. The words SHOOT and MEET are synonyms.

12. MATCH. A single event in a tournament.

13. REGISTERED TOURNAMENT. A tournament authorized by the appropriate officer of the NBRSA and conducted under these Rules and Regulations and in accordance with the official tournament procedures approved by NBRSA as set forth in this Rule Book.

14. RESTS.

Varmint, Sporter, and Hunter Class Rest shall support the front part of a rifle. A rear rest shall support the rear part of a rifle. Neither rest may be attached to the bench, the rifle, or the other. And each shall be moveable independently of the other.

Unlimited Rests may incorporate guiding means, and adjustments for elevation and windage in either or both components. Front and rear rest may be attached or on a single plate. An unlimited rest may NOT be attached to a bench by any means whatsoever.

Sand bag shall be a bag without additions, containing sand only, and at least ½" thick over its entire surface. The bag must be able to be deflected horizontally at least ¼" with finger pressure at any point. The portion which contacts the rifle shall contact the entire surface under the fore-end. The rear sand bag shall be a bag, or combination of bags containing sand only, the bag must be able to be deflected horizontally at least ¼" with finger pressure at any point. A vertical spacer under the rear bag will be allowed as long as they incorporate no adjustments for windage or elevation. The vertical spacers shall not contain any protrusions which can be inserted into bench top or the sand bag and the top and bottom surfaces of the vertical spacer must be flat. The rear bag shall not be contained in any manner.