Western Precision "Fool Proof" (Fp) Series sight has internal micrometer adjustments with positive internal locks; CVA Accura Series, Optima Series and Wolf FP Micro-adjust sight set; Fits: CVA Optima, Accura, Accura LRX, Accura MRX and Wolf; FP micro-adjust rear peep sight with thumb knobs for quick ease of adjustment; Skeletonized front globe sight for optimal ambient light transmission; 6 piece metal reticle insert card; The FP Receiver Sight is strong, rugged, and dependable while providing a large range of windage and elevation adjustments; The alloy used to manufacture this sight has a tensile strength of 85,000 pounds; It is light and compact, weighing only 1-1/2 ounces; Depending on the muzzleloader model, each FP receiver sight will pair with the correct height Western Precision Sight skeletonized front globe; All of the Western Precision front globe sights will pair perfectly with Williams various metal and fiber optic reticles