Versatile, sturdy, light, fast. Time-proven design. Quality manufactured W/Heat-Treated steel & hard alloys. Black anodized finish. Quick-detachable. BR-1A2 br: lowest Bipod. Most useful for shooting off the bench. Pistol shooters favorite. BR-1A2 L: compact & light. For prone position or benchrest. BR-1A2 h: for prone or sitting shooting, best for varmint shooting.model 25: some may be more comfortable in prone positoin. From sitting, extra height allows more leeway in shooting at an elevated target. Most versatile of the tall rests. BR-1A2 25c: tallest of the Series. May be better suited for unusually tall or heavy men. Note: "s" models rotate to either side for instant leveling on uneven ground..