tar21 or k2

ok so i got a k2 and deagle rite now and 16k and imma lvl up soon and get the 30k gp bonus
so im thinking if i shud sell my k2 and buy a tar21
is it better than k2??
and i heard tht the tar21 is exatcly the same as m4 is this true too??
but yea shud i keep my k2 or sell it and buy tar21?

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