Why is Scar without a large number of equipment in army?

So the assault musket of the class on air of a high end, common unit is to did not have a qualification to use of course, the English full name that SCAR cent unlock comes to is Special Operations Forces Combat Assault Rifle, the interpreter comes over even if special type troops fights assault musket, and in fact this also is Belgian FN company really fight technically for American special type headquarters makes technically, do so you say third class red deer (army) with 4 embellish waiting for a horse (Marine Corps) qualified use? But undeniable is SCAR it is a good gun really, it is used modular design, can add not only install all sorts of firearms fittings, and the barrel that different requirements can change inside short time, can match at the same time 5.56 with bullet of two kinds of 7.62 caliber, these two kinds of caliber can change his costume or dress respectively snipe configuration and configuration of fighting at close quarters, battlefield adaptability is wonderful. On the accuracy that values most in firearms, SCAR is in 300 0.5~0.7 MOA is less than inside rice, the target that is apart from to 800 meters hits the target rate achieved 70% , cross an U.S. Army apparently high to make the M16 of type and M4 series musket. On dependability, because SCAR used the double closedown of AK type dash forward rifle bolt of type of bamboo shoot circumgyrate and fixed cast housing to hold out, also be absolutely wear-resisting is able to bear or endure Cao, in the test of contrast of sand and dust that the U.S. Army had 2007, SCAR fault rate is apparent under M4, gotten U.S. Army particular kind fights the accord of headquarters reputably. Cannot denying SCAR is a good gun, but a minute of money a minute of goods, although SCAR is good, but price is very expensive also. SCAR rolled out civil version in North America market 2008 when, initial price is 2000 dollars / , be fried madly later 10 thousand dollar / , and SCAR purchases the value mediumly in the U.S. Army is 1500 dollars almost / , watch M16 and M4 series instead highest also do not exceed 800 dollars / , so expensive gun, if be large-scale,purchase, hundred thousands of come down, but that is astronomical, if plus maintain at ordinary times safeguard, change fittings, even if weathy U.S. Army also bears not to rise. The last reason, when SCAR is born, already extensive line installed the U.S. Army the improvement of M4 and M16, these two kinds of firearms are long classics battlefield test, can have satisfied a gleam of of common unit fight basically demand, make the demand of type weapon completely without transhipment of through cargo. Although these two kinds of musket also are put in the indisposition of get stuck of a few such as, but the department of defense and congressional how are those old man likely because so is dot indisposition beautiful gigantic endowment Where is large-scale transhipment of through cargo?