If cutting weight down to the last gram is your ultimate goal, look no further than the amazing line of parts from 2A Armament. Their lightweight AR15 rifles are the stuff of legends, with complete 16" barreled examples such as the BLR-16 Gen 2 rifles weighing in at little over 5 lbs unloaded - that's a pound lighter than an MP5 with a 9" barrel! Of course, the 2A Armament rifles are effective at ranges where the MP5 wouldn't dream of making hits. How does 2A Armament do it? By paying attention to the little things, saving weight everywhere they can without sacrificing functionality. Titanium gas blocks, titanium regulated bolt carrier groups, titanium muzzle devices and compensators, and even titanium takedown pins all add up to big weight savings over steel parts without sacrificing strength. Titanium comes in between aluminum and steel in terms of weight or mass but often exceeds steel in terms of strength for certain applications. They offer lightweight AR barrels, too, in 5.56, .308, and 6.5 Creedmoor, among other calibers, but unfortunately these can't be made of titanium. They're 416R stainless steel with a nitride finish and machined to balance weight and strength. Another area where weight can be saved on an AR is the handguard, and 2A Armament has made great strides there. Where other companies call handguards weighing about an ounce per inch of length lightweight, 2A's M-LOK Aethon handguard rails come in at just 8.9 ounces for a 12" rail - with a titanium barrel not, not aluminum! No matter which AR-15 rifle parts you seek, you can count on 2A Armament to deliver high quality and low weight.