SIG Sauer P320 RXP Full-Size 9mm with ROMEO1 PRO & Grayguns Upgrades
This factory-optic P320 stands out by combining SIG’s modular 9 mm striker-fired platform with Grayguns performance parts and a factory-installed ROMEO1 PRO red dot. The result is a full-size pistol that arrives ready for competition, duty, or range work, offering enhanced ergonomics, a crisp adjustable trigger, and true co-witness night sights—all in excellent condition.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – Sharp lands and grooves.
Specific Condition Notes: Only minimal handling marks are visible, and the bore remains bright and clean.
What’s Included
- SIG Sauer factory hard case (gray polymer)
- SIG Sauer P320 owner’s manual
- SIG Sauer ROMEO1 PRO optic manual
- SIG Sauer ROMEO1 PRO 6-MOA red-dot sight with protective steel shroud (factory-installed)
- 1 × 21-round steel magazine (extended base pad)
- 1 × 17-round steel magazine
- 3 × 10-round steel magazines
The serialized, removable fire-control unit makes this P320 fully modular, allowing caliber or size changes without replacing the whole pistol. SIG outfits the Nitron-finished slide with an optic cut and both forward and rear serrations, then installs a ROMEO1 PRO that co-witnesses with suppressor-height tritium night sights for immediate, out-of-the-box accuracy.
Grayguns upgrades elevate handling and trigger control. The laser-sculpted X-Full grip module delivers aggressive but comfortable texture, while the adjustable flat-faced trigger shortens reach, reduces pull weight, and provides an over-travel stop for a clean, repeatable break.
Controls are user-centric: ambidextrous slide-catch levers and a reversible magazine catch support left- or right-handed operation, and tool-less takedown never requires pulling the trigger. Internal striker-block and sear-block safeties add passive security without hindering the smooth striker-fired action.
A full-length, five-slot M1913 rail up front welcomes lights or lasers, and the 4.7-inch barrel balances sight radius with maneuverability. With five included magazines—up to 21 + 1 rounds on tap—this RXP package is range-ready the moment it arrives.