Pic #2 looks like a Liberated Hunting rifle if I am wrong excuse my ignorance I know the Britishicon in WWI utilised African Game Rifles to bash down the steel loop holes and were disliked by the infantry as there was always to much noise and dust from these things and of course retaliation fire in the form of a good old barrage as there was plenty of artillery there which both sides like to lavish on each other.

Pic #4 one would hope the rifle is unloaded probably not in a war zone but I do not think it is on half cock either looking at the length of firing pin and cocking piece in view and the mag cut off disengaged to boot!

Funny how the world of tactics has changed in various conflicts the snipers were disdained and often shunned as they brought perceived grief if they eliminated the enemy by the barrages the group suffered from the snipers skill.
Now days they are seen as an asset to dominating a battlefield given the weapons they can deploy from the Nato round to the 50 Barrett, 416 Barrett, 375 Cheytac this round is purported to still be supersonic at a range of 2,500 M yes they can and do "do the business".