The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount. [1] It was designed and built by United Defense, a company later acquired by BAE Systems Land & Armaments, which continued manufacture.

5英吋／54（Mk 45）艦砲是一現代化的輕量艦砲系統，是由5英吋（127 mm）L54 Mk 19砲與MK 45炮座組合而成。 Mk 45艦砲是為打擊水面艦艇、空防以及兩棲登陸 岸轟支援 （ 英语 ： Naval gunfire support ） 等多元目標設計。

5英吋/54(Mk 45)舰炮是一款现代化的轻量舰炮系统，是由5英吋(127mm)L54MK 19火炮与MK 45炮座组成。 Mk 45舰炮是为打击水面舰艇、空防以及两栖登陆岸轰支持等多元目标设计。

The Mk 45 Mod 4 provides NSFS range of more than 20 nautical miles (36 km) with the Navy's new 5-inch Cargo projectile and an improved propelling charge. Operation and performance of extended-range munitions are tailored for optimal effect and range in unison with the major subsystem upgrades of the Mk 45 Mod 4 Naval Gun.

The Mk 45 Mod 0 was developed and produced by BAE Systems, as the world’s lightest, most compact, 5-inch (127-mm) 54-caliber, fully automatic naval gun system. This basic configuration Mk 45 was initially deployed onboard the U.S. Navy’s.

Sep 20, 2021 · The MK 45 gun was developed as a lighter weight, more easily maintained replacement for the MK 42 5"/54 caliber gun mount.

Feb 27, 2025 · 5英寸／54（Mk 45）舰炮是一现代化的轻量舰炮系统，是由5英寸（127 mm）L54 Mk 19炮与MK 45炮座组合而成。 Mk 45舰炮是为打击水面舰艇、空防以及两栖登陆 岸轰支援 （ 英语 ： Naval gunfire support ） 等多元目标设计。

Fully-automatic naval gun mount employed against surface (Anti-Surface Warfare - ASuW), air (Anti-Air Warfare - AAW), and land attack (Naval Surface Fire Support - NSFS) targets. The MK 45 gun...

MK45Mode4型舰炮，由127mm高能火炮、增程制导炮弹（ERGM）和NSFS火控设备构成的Mk45Mode4型舰炮武器系统与以前相比，在反应能力、适应能力、毁伤能力等方面都有了很大提高。

研制成功的MK45型舰炮重量仅有22.5吨，操作人员减少到6人，机械结构也有所简化，提高了可靠性，更便于维修。 但发射率则降低到20发/分。 如今，MK45型127mm舰炮已成为美国海军大、中型水面舰艇上的标准装备。 在近40年的服役期间，MK45型127mm舰炮经历了多次技术改进，发展了Mode0、Mode1、Mode2型和Mode4型等多种型号。 近两年才装备的Mode4型在舰炮结构上作了重大改进，其综合性能有明显提高。 同时，新型弹药及应用技术层出不穷，这使MK45舰炮 …