cannot be removed by the bolt locking lugs but instead by the takedown tool housed inside the grip. It has a "heavy duty castle nut", which is more robust than the previous version, therefore making that weak spot more resistant to impact. As of 2013, Heckler & Koch replaced the original HK416 with the A5 variant. HK416 A5 – 11": sub-compact with a 279 mm (11.0 in) barrel HK416 A5 – 14.5": carbine 368 mm (14.5 in) barrel HK416 A5 – 16.5": rifle with 419 mm (16.5 in) barrel HK416 A5 – 20": full-sized rifle 508 mm (20 in) barrel HK416 A7 The HK416 A7 is designed for the German KSK and KSM, (designated as G95). A new safety selector has been installed, which rotates 45 degrees rather than 90 degrees as on the M16/M4/AR standard safety selectors. The new configuration of the selector is comparable to those of aftermarket 45-degree safety selectors. The HK416 A7 also features a KeyMod Rail System, which is more lightweight than the traditional Picatinny Rail Systems. HK416 A8 In March 2021, the German Federal Ministry of Defence announced the adoption of the HK416 A8 to supersede the G36 as the standard rifle of the German Armed Forces. The HK416 A8 is similar to the HK416 A7, but it features a height-adjustable shoulder support on the stock, a steeper grip angle as well as a shorter hand guard to comply with the required maximum weight of according to the tender. According to the Federal Procurement Office (BAAINBw Federal Office for Equipment, Information Technology and Use of the Bundeswehr) the Bundeswehr will receive the weapon designated as G95A1 as the new standard rifle. The Kurz or short barrelled version for "specialized forces" will be designated as G95KA1. Civilian variants Civilian variants of the HK416 and HK417 introduced in 2007 were known as MR223 and MR308 (as they remain known in Europe). Both are semi-automatic rifles with several "sporterized" features. At the 2009 SHOT Show, these two firearms were introduced to the U.S. civilian market renamed respectively MR556 and MR762. There is another variant of the MR556 called the MR556A1, which is an improved version of the former. It was created with input from American special forces units. The MR556A1 lets the upper receiver attach to any M16/M4/AR-15 family lower receiver, as the receiver take-down pins are in the same standard location. The original concept for the