This mech paper model is Striker, originally designed by the SLDF high command in 2571 for non-Royal SLDF units, from the Classic BattleTech, the papercraft is created by Yogsolthan and Smoking Mirror, skins by Sturm. The size of finished model is about 230 (H) x 154 (W) x 113 (D) mm.
Along with the Stalker, the Strikerbecame one of the most common 'Mechs in service. The Striker was built with the intent of being rugged and reliable, but more importantly, allowed House Lords to reserve their precious and limited numbers of assault BattleMechs for their own personal armies. In this way, the Striker may have been the show of good faith the House Lords needed to make the Star League work. In spite of the 'Mech's dependability, the Striker was marginal compared with later assault BattleMechs, and was eventually relegated to serving in militia units, with the highest concentration ending up on the rimward edge of the Terran Hegemony. After the destruction of the Stormvanger lines in 2867, fewer than 300 Strikers were known to exist. [Source: sarna]
You can download the papercraft model here: Classic BattleTech - Striker Free Mech Paper Model Download [Skins]