Review

The Glock 45 parts worth buying, with live retailer prices. The G45 is a Gen6 gun, so three optic plates and a flat trigger may already be yours, and the number 45 means three different things in a parts search.

The FN 509 parts worth buying, with live retailer prices. Includes what FN own manual calls the optic cut, the patent number that tells you which plates fit, and why this list runs to eight picks instead of ten.

The Glock 21 parts worth buying, with live retailer prices. Includes what GLOCK own 2026 Buyer Guide says about whether the .45 is getting a Gen6, and why that decides which optic plates and triggers you should buy.

The HK VP9 parts worth buying, with live retailer prices. Includes the one VP9 choice HK own manual says you cannot undo, the optic plate the gun will not take a red dot without, and why there is no trigger on the list.

The SIG P229 parts worth buying, with live retailer prices. Includes what SIG own manual actually says about the SRT trigger kit, the takedown step it changes, and the magazine trap that catches P229 buyers.

The Beretta 92 and M9 parts worth buying, with live retailer prices. Includes the three-step decocking safety function check from the pistol military manual, which is what you should run after any trigger, spring or decocker work.

The Springfield XD parts worth buying, with live retailer prices. Includes what we found when we counted Springfield current XD lineup, and the new XD Mod.4 that changes which optic and grip parts you need.