Dillon Primer Magazine Alignment Gauge Set by JW Systems Dillon Primer Magazine Alignment Gauge Set This is a precision ground gauge set that fits RL 550 and XL 750 priming systems. It aligns the Dillon Primer Magazine Tube to the Primer Slide Assembly. Stops flipped primers, skipped primer pick up,... MSRP: Was: Now: $34.95 Add to Cart