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Recently purchased a brand new ar-15 type rifle, .223 caliber. The gun shop employee mentioned about breaking it in. The instruction manual mentions nothing of this.
What gives? Did they need to be broken-in in the past and that no longer applies to modern firearms?
If they do need breaking-in, what grain should I use?
A chrome lined barrel does not need break in. Giving most Ar15s are chromed lined, it might be the reason it is not mentioned. This was not always the case, so the dealer maybe unaware, or simply still prefers breaking in anyways.
If by chance it is not chromed line, then you're simply firing a 3-5 rounds, and then cleaning the barrel, repeating this for 30 or so rounds. The break in of a AR15 is not critical as say a sniper rifle, so I wouldn't put too much effort into this-unless you're using it as a long range precision rifle.
AR15 commonly use 55grains-without knowing the twist rate, I would guess a 1/9- so stick to this. You would however be safe up to 62 grains, but some guns do not properly stabilize the round.
Breaking in period?
