Users
United States: Standard-issue sidearm (MRD-LE variant) of the Los Angeles Police Department as of 2021. [22]
| FN 509 | |
|---|---|
| Type | Semi-automatic pistol |
| Place of origin | United States |
| Production history | |
| Designed | 2015 |
| Manufacturer | FN America |
| Unit cost | $649 (MSRP) |
| Produced | 2017–present |
| Variants | See Variants |
| Specifications | |
| Mass | 26.9 oz (760 g) |
| Length | 7.4 in (190 mm) |
| Barrel length | 4.0 in (100 mm) |
| Width | 1.35 in (34 mm) |
| Height | 5.56 in (141 mm) |
| Cartridge |
|
| Action | Double action |
| Feed system | Box magazine |
| Sights | Fixed 3-dot (standard); Tactical and MRD [a] variants accept red dot sights |
The FN 509 is a polymer frame striker-fired semi-automatic pistol manufactured by FN America, a division of FN Herstal. It is chambered in 9×19mm Parabellum featuring double-action operation and a Picatinny rail located forward of the trigger guard. Tactical, midsize, and compact variants have also been made available.
Two other models, the FN 510 and the FN 545 (10mm Auto and .45 ACP respectively) were introduced in 2023. [2]
As part of the XM17 Modular Handgun System competition (MHS) initiated in September 2015, FN Herstal entered a polymer-framed, striker-fired pistol, derived from the FN FNS. [3] After SIG Sauer won the competition in January 2017 with a modified version of the P320, [4] [5] FN America brought a version of their entry, now known as the FN 509, to the commercial market. [6]
FN sought consultation from retired Delta Force operator Larry Vickers during early development of the FN 509. [7] FN America stated that during development and testing of the MHS entry and the FN 509, over a million rounds of ammunition were used. [8]
The FN 509 is a striker-fired handgun with a stainless steel slide with ferritic nitrocarburizing finish and a polymer frame. Black and flat dark earth (FDE) colorings are available. Barrel length is 4.0 inches (100 mm). The slide has serrations on both front and back, for easy slide manipulation. There is a full-sized grip, housing 17-round magazines; 10-round magazines are available for states with a high-capacity magazine ban.
The backstrap of the grip accepts interchangeable inserts; one arched and one flat. [6] Instead of a manual safety, the 509 includes an integrated trigger safety (the articulated trigger type like the FN FNS) as part of its four passive safety systems: a striker block, a drop safety, a trigger disconnect and a trigger safety lever. [9]
Magazine releases and slide locks are present on both side of the gun. [9]
Several variants of the FN 509 have been made available: [10]
Also available are an inert training pistol, [11] and a Simunition (simulated ammunition) pistol. [12]
| Specification | FN 509 | FN 509 Tactical | FN 509 Midsize | FN 509 Midsize MRD | FN 509 Compact MRD |
|---|---|---|---|---|---|
| Barrel length | 4.0 in (100 mm) | 4.5 in (110 mm) | 4.0 in (100 mm) | 3.7 in (94 mm) | |
| Overall length | 7.4 in (190 mm) | 7.9 in (200 mm) | 7.4 in (190 mm) | 6.8 in (170 mm) | |
| Overall width | 1.35 in (34 mm) | ||||
| Height | 5.56 in (141 mm) | 5.75 in (146 mm) | 5.2 in (130 mm) | 4.8 in (120 mm) | |
| Weight | 26.9 oz (760 g) | 27.9 oz (790 g) | 26.5 oz (750 g) | 25.5 oz (720 g) | |
| Magazine capacity | 17-round | 17-round† | 15-round | 12-round‡ | |
| Optics mount | No | Yes | No | Yes | Yes |
| Color | Black or FDE | Black or FDE | Black | Black or FDE | |
| Reference | [15] | [16] [17] | [18] | [19] | [20] [21] |
For all variants, 10-round magazines are available for states that restrict capacity.
† For the Tactical variant, 24-round extended magazines also available.
‡ For the Compact MRD variant, 15-round extended magazines also available, which increase height to 5.2 in (130 mm).
United States: Standard-issue sidearm (MRD-LE variant) of the Los Angeles Police Department as of 2021. [22] 
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