Anti Roll Pins

I would definitely use the anti-roll /anti-walk pins. In fact, I recently retro fitted my AR's with them. Anti-roll pins, such as the KNS type ($30), usually accomplishes both anti-roll as well as anti-walk. For precision triggers , you do not want the pin to roll. It makes for a better and more consistent trigger pull if it does not roll. However, be aware that some very fine precision trigger systems, such as Geisselle, may not work with the anti-roll pins and will advise such on their instructions.

For my precision AR's I installed the KNS type anti-roll pins. For my every day stock AR's, I installed simple anti-walk pins ($9) as I have had some issues with pins walking and it is an easy, cheap fix.

I wouldn't. A solution in need of a problem. The normal ones work just fine.

Completely unnecessary on a semi-auto build unless you are doing it on a lower receiver that already has "egged-out" fire control parts.

Worthwhile on a full-auto -- especially where you are basically dealing with a registered lower receiver that is worth $10,000 versus a common $40 semi-auto receiver.

If you think you are going to shoot your semi enough to "egg-out" the fire control parts, in view of how much you will spend on ammo, and barrels, to do that, you can surely afford to buy a footlocker full of stripped lowers.

eldon519 said:

I wouldn't. A solution in need of a problem. The normal ones work just fine.

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This. Really only needed for some triggers or if your lower is a little out of spec.

I have 6 AR's. had issues with pins walking on 2 of them so i installed anti-walk pins on all of them to prevent problem. YMMV.

My Suppressed SBR had issues at a rifle course with the pins walking out where we were shooting hundreds of rounds in short periods of time. I had to push them back about every 30 rounds before they knocked the spring off. I replaced them with the anti walk pins and have had no problems.
I hate when people say that it is a solution to something that hasn't been a problem...just because they hadn't experienced that problem.

I like the KNS pins quite a bit. I use them in my builds.

I have one set of anti roll pins in an AR. It was one that I bought for my daughter, already had them installed.

Haven't has a problem with the rest of them though.

I bought a set for my 9mm build just in case, because I had the trigger pin break. Now it may have been a defective trigger pin, but we will never know. It currently has less than 1000 rds through it but if it breaks again I will be ready.

While the anti-roll pins are not "needed" on a semi-auto build, I have noticed a bit of improvement in trigger pull on SOME rifles. Not all. I have no idea what makes the difference, other than some part of the fire control group in some lower parts kits. I have several AR's and have tried them in all of them. Two still have the pins in because I noticed a difference in trigger pull. The rest do not, as I noticed no difference. If you've got them on hand, give it a whirl with and without.

I purchased a used Noveske N4 lower at the height of the panic which had a set of KNS anti-rotation pins installed on it.
I asked the previous owner if the holes were out of spec and I was told that he installed the KNS pins in the lower when it was being built.
I gauged the holes to confirm that they were in spec.
I have not noticed any negative effects from these pins being installed even on a Geissele SSA-E trigger.

I have KNS pins in both my AR's. My bottom line decision after reading many such threads as this one, and listening to people argue back and forth about the usefulness of them, was that it's cheap insurance. For less than %1 of the total price of my build, it took one possible failure point out of the equation.