Quoted: I have 2 rifles:
Complete Bushmaster with 14.5" 1/9 flat top with Eotech 551 and a Bushmaster lower with a Colt 16" 1/9 HBAR flat top upper with Eotech 511. Both rifles are zeroed at 25 yards and POA is POI with 55 grain FMJ.
At 50 yards the 16" keeps the POA / POI, but the 14.5" shoots about 2 inches high. Is this because of the 1.5" barrel difference?
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Congratulations! You have defied the laws of nature and contradicted priciples of physics held to be true for hundreds of years!
IF (and I emphasize IF) both rifles are POA/POI at 25 yards, then both rifles will hit exactly the same amount (for all practical purposes - tenths of an inch don't count) high at 50 yards. If this is not the case, then the rifles are not truly zeroed at 25 yards.
BTW, I would recommend zeroing at 50 yards.