At one time ATK ( a darn large military complex company that owns CCI, Speer, Federal, Outers, has contract to run the Lake City ammunition plant for military ammo (and many other companies) owned Nitrex, Intensity and Weaver scopes (may have had rights to Redfield name too, before Leupold). As I recall, Nitrex and Intensity were marketed thru different channels than Weaver. ATK sold Weaver to Meade (telescope maker), who owned Simmons and forget other old scope brand, leaving Nitrex and Intensity ATKs main lines of rifle scopes. Evidently, ATK realized this was a mistake and reacquired Weaver from Meade about a year or so later. Once ATK had Weaver again, they discontinued Nitrex and Intensity brands. So, Nitrex line was made by Low of Japan, the same company making the Weaver Grand and SuperSlam scopes as well as Bushnell's Elite line of scopes.....forget other top brand(s) of scope they make. LOW used same optics and internals in Nitrex scopes they used in Weaver Grand and Super Slams. Light Optical Works (LOW) has been described as maybe the best scope maker in Asia. The Intensity line of scopes were basically Weaver 40/44s and are made in Philippines.....some rumor that LOW owns or has a large interest in this Philippine plant.
Nitrex and Intensity lines were discontinued and remaining inventory of these brands were sold at a very good price discount, some models with rebates too. For example, I bought a Nitrex TR2 4-20x50 for about $280 (after $100 rebate) and this same scope in Weaver as a Super Slam today you might find priced between $550 to $600, list price of over a $1000. Natchez Shooters Supply evidently handled the selling of Nitrex inventory. Intensity brand inventory sold by Natchez and Sportsmans Guide. Intensity scope I bought cost me around $90 and as a Weaver 40/44 it sells for around $190 or more. Ooops, forgot Natchez very recently reduced this Weaver 40/44 to $140. If I needed another scope in this power range, I'd not hesitate to order one of these.
By the way, Weaver handles the life time warranty on the discontinued Nitrex and Intensity lines.