this is the berret m468(now known as the rec7)
http://img337.imageshack.us/img337/4804/dpp0002sw0.jpg
this is the HK-416
http://www.airsplat.com/Images/ER-VFC-HK416-10.jpg
and you already see the the similarites between the three
-same butt
-handguard
-same barrel
-ect
well i brang up this because there is no visiable difference between the three
but performance wise the turkish and Hk-416 would preform about the sme as the m-16. why well becouse of the amunition both use the 5.56x45 round the same as the m16
i did some research and i found out the 5.56mm round was made to be a fast piercing bullet the tumbles as it enters the flesh creating lots of damage.Now the ak uses a 7.62mm round which was made to in a good 200 meter range were it could pierce thru the target punching it and essienchly piercing anybody else behind or peirce thru a bunker and the enemy on the other side.
5.56mm could go far and fast ,hit the enemy but not knock down a target in at 200 meter effective range
7.62mm could not go as far had half the speed of a 5.56 round but could if the enemy was hit it would throw the enemy down under a 200 meter effective range but out of 200 nters the bullets would just fall to the ground
so berret got the best of both worlds and made the 6.08mm round
so performance wise the berret is the best out of all three and if you disagree please back yourself with good evidence