It's such an expensive pain getting an FFL to do a transfer on an internet ordered gun in California that I did the smart thing and added on a bunch of Labor Day sale Aero Precision M5E1 and M4E1 lowers to my ARC Nucleus order to stock up and give a few uppers dedicated lowers instead of having to mix and match.
I wound up spending a couple hours getting about 2.5 lowers together, testing triggers and checking upper to lower fit.
The uppers I had are mostly matching Aero enhanced uppers with the inverted barrel nut and matching handguards.
The upper to lower fit on the matching combos seems very good. I was ready to use oversize pins and ream the holes to fit but the stock pins gave it a fit that doesn't have enough wobble to complain about and there is an extra screw to push up on the upper receiver rear takedown pin boss to remove slop that way. If it ever becomes an issue, I can tighten it that way.
Now I need to make a shopping list for the last few items I need and finish assembling the rest of them.
The Aero Precision matching receivers are really nice. They have an integrated trigger guard so no roll pin or trigger guard gap to irritate your finger. They have a set screw bolt release pin so no roll pin their either. That makes for zero roll pins in the lower. The Aero M5 LPKs go together easily. I usually polish the detent pins and go over everything to make sure there aren't any burrs or other problems with the LPK. That was time well spent on the AR Stoner LPKs I used for the M4E1 lowers but the Aero M5 LPKs were pretty much ready to go beside cleaning off the sticky lube they use. I expect the Aero M4 LPK would be the same.
The enhanced uppers are very nice too. I have never needed a full length top rail so I have been trying to use the Quantum Mlok handguards from Aero. They can be dirt cheap when bought on sale and using a coupon. The Mlok will let me put rails or accessories anywhere I need and acts as a vent so barrel cooling will be good. The upper to match is a bit more expensive than some but since it reinforces the front of the receiver it eliminates POI shift when heavily loaded on a bipod, sling or maybe pressed against a tree for a rest. Overall, it's cheaper than a cheap upper with an expensive handguard and it has some benefits that you can't get without buying an even more expensive upper.
Any way, thanks to Schuyler Arms for the great Labor Day sale prices. Their shipping was pretty fast. Any Aero Precision parts shopping I have to do in the future will start there. I only have 5-6 go to retailers for online gun parts orders but they did plenty to get on that list.
Now I've got to finish the rest of these things.
I wound up spending a couple hours getting about 2.5 lowers together, testing triggers and checking upper to lower fit.
The uppers I had are mostly matching Aero enhanced uppers with the inverted barrel nut and matching handguards.
The upper to lower fit on the matching combos seems very good. I was ready to use oversize pins and ream the holes to fit but the stock pins gave it a fit that doesn't have enough wobble to complain about and there is an extra screw to push up on the upper receiver rear takedown pin boss to remove slop that way. If it ever becomes an issue, I can tighten it that way.
Now I need to make a shopping list for the last few items I need and finish assembling the rest of them.
The Aero Precision matching receivers are really nice. They have an integrated trigger guard so no roll pin or trigger guard gap to irritate your finger. They have a set screw bolt release pin so no roll pin their either. That makes for zero roll pins in the lower. The Aero M5 LPKs go together easily. I usually polish the detent pins and go over everything to make sure there aren't any burrs or other problems with the LPK. That was time well spent on the AR Stoner LPKs I used for the M4E1 lowers but the Aero M5 LPKs were pretty much ready to go beside cleaning off the sticky lube they use. I expect the Aero M4 LPK would be the same.
The enhanced uppers are very nice too. I have never needed a full length top rail so I have been trying to use the Quantum Mlok handguards from Aero. They can be dirt cheap when bought on sale and using a coupon. The Mlok will let me put rails or accessories anywhere I need and acts as a vent so barrel cooling will be good. The upper to match is a bit more expensive than some but since it reinforces the front of the receiver it eliminates POI shift when heavily loaded on a bipod, sling or maybe pressed against a tree for a rest. Overall, it's cheaper than a cheap upper with an expensive handguard and it has some benefits that you can't get without buying an even more expensive upper.
Any way, thanks to Schuyler Arms for the great Labor Day sale prices. Their shipping was pretty fast. Any Aero Precision parts shopping I have to do in the future will start there. I only have 5-6 go to retailers for online gun parts orders but they did plenty to get on that list.
Now I've got to finish the rest of these things.
