This is based on a Q&A in Billed Bladet #5, 2014.
Where a Johnnie Larsen would like to what rifle the Royal Lifeguard Regiment uses.
Jon Bloch Skipper gives a detailed but not complete reply, so I'll add some additional details.
The Lifeguard Regiment was formed during the Skanska Wars in mid 1600's and by then they would have looked like figure #21 in this illustration: https://app.box.com/s/dzxlcz47qq7oeko1iw4y
By then they were equipped with pikes and matchlock muskets.
But technology went ahead and by the time of the great Nordic War, the flintlock musket had been introduced. Although the bayonets were jammed into the barrel for a few decades more and used more like a pike, until mid 1700's
See figure #37 in this illustration: https://app.box.com/s/1ic24fzyaz0dasq8n1s4
By the time of the Napoleonic Wars, uniforms and weapons had developed.
Here is a guardsman from 1807, still uniformed like a typical grenadier of the time: https://app.box.com/s/16lviopuuwwarhv0v8i2
The musket was this state of the art model: https://app.box.com/s/zajxgep5ijdgodbccp2g
By the mid 1800's that was hopelessly oldfashioned and the Remington Rifle M1867, percussion rifle was introduced. Firing a heavy 12 mm projectile.
It was soon obsolete and by the late 1800's the bolt actions Krag-Jørgensen rifle M1889 was introdued and used well into WWII. It was also used by the US army in the Phillippines, so American members may be familiar with the weapon? https://app.box.com/s/civ33cwyh8yaxz2jlax7
Right after the Liberation in 1945 the first guards battalions standing guard for the DRF were issued with second hand German Mausers K98 https://app.box.com/s/81ie5rjvmtdqp90f8ltn
But the Garand (M50) was soon introduced as the standard rifle and remained in use in the guards battallion well into the 1980's: https://app.box.com/s/nx61l60jvkhnnjsrufox
Until it was replaced by the German Hechler & Koch (M75), 7.62, a ridiculously easy to use rifle which I have carried around alot in my time! The Royal Lifeguard however used a model with an extended butt, to make it easier to use for tall guardsmen on the parade ground and with a special three round magazine: https://app.box.com/s/pwvup64a5wa7a3usv2dz
Today however, the modern guardsman: https://app.box.com/s/k5jp5ewjfvtkmjy6s05t
use the Colt Canada C7 (M95) 5.56 https://app.box.com/s/vxx2ywq1fl4tfo10kiva
Without the scope and with an extended rifle butt. - That weapon has actually been replaced by a more modern version, but it is used by the guards battallion because of it's length and because it to be honest is more pleasing to look at than the more functionalistic looking modern carbines.