.22 conversions and optimal barrel length question

I am looking to put together either a 10.5 or 7.5 sbr and would like to throw a .22 conversion kit in it for plinking. Does either of these barrel lengths hinder the function? Is one a better choice over the other for that purpuse? Thanks in advance for the responses!

Knight––
I ran a 7.5" 5.56 SS barrel with a CMMG 22 conversion for a while and had decent groups for 25yd shots. The recoil felt like someone tapping you on your shoulder.

If you want to train, go with the barrel length you'll shoot most out of in 5.56 and build a conversion upper for it with the same barrel length to have similar ergonomics.

I run a 10.5 upper with a cmmg conversion with zero problems. The kit runs 100% and I've probably put 5k or more rounds through with no problems. I usually will shoot a mag or 2 of .223 after a range session of using .22 and have had no issues running .223/5.56.

With a stainless CMMG 22 kit a dedicated 5.5" barrel should run fine, if a suppressor is used then a 4.5" will run good.
If using a kit in a 223 barrel then any length that the rifle catridge will work the 22 kit will too, 7" up
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http://www.ar15.com/forums/t_3_15/556791_Dedicated_22_hand_guard_with_SBR_and_Pistol_barrel_length_for_the_look_you_want.html

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