User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20170106035554/@comment-29963364-20170106063651

@Omega

That is exactly what an Irregular is.

Issei's IMT and CCP are power-ups resulting from Issei combining/fusing his Boosted Gear Scale Mail with his Evil Pieces. He uses the Evil Pieces to channel Ddraig's power into his Balance Breaker in order to increase it's stats, making it stronger.

So yes. The IMT and CCP are Irregular Balance Breakers. Even Vali, in vol.21 said that They were.

And yes, I forget to mention Saji's case. His Balance Breaker [Malebolge Vritra Promotion] is, in fact, an Irregular Balance Breaker.

Oh and...

[" It was explained that Sacred Gears are special in that they are a tendancy to combine powers together."]

That's the case for the "Longinus" Sacred Gears. Azazel said that a common trait of the Longinus is that they have more than one type of ability/power, while standard SG's usually have only one type.