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Ok here is my dumb question of the day.

On an 18 brl, what length handguard should I be looking to buy 12/15? This will go on a aero m5e1 upper

Quoted:
Ok here is my dumb question of the day.

On an 18 brl, what length handguard should I be looking to buy 12/15? This will go on a aero m5e1 upper

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On an 18 brl, what length handguard should I be looking to buy 12/15? This will go on a aero m5e1 upper

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Decent thread! I read everything from 2018 to now. About the most recent 20 pages or so.

Got my Aero M5 stripped lower on the way

Here is a list of all the other parts I decided on:
Geissele ssa trigger
Radian raptor vented charging handle
KAK unbreakable bolt catch, mag catch
Spikes 308 buffer tube, buffer spring and short 5.8oz 308 buffer
Beveled bcg (aero)- will have extra bolt since barrel comes with one.
Aero m5 stripped upper
Aero 308 dust cover
Bcm forward assist
Melonite gas tube spikes rifle length ar15(works with my barrel choice)
Aero m5 enhanced gen2 mlok rail 15in
Surefire 3 prong or warcomp to run RC1 and 300sps(in jail)
Law folding adapter gen 3- “it folds!”
Supurlarive arms bleed off gas block clamp on type (hope it fits under the rail?)
Aero or troy style ar15 flip up sight set
ergo grip-
Sopmod stock
Criterion 16in hybrid m118lr 1/10 w headspaced jp bolt

Tips/suggestions/criticisms all welcomed and appreciated.
Thanks!
I hope this will give my scar17s a decent run for the money.

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Decent thread! I read everything from 2018 to now. About the most recent 20 pages or so.

Got my Aero M5 stripped lower on the way

Here is a list of all the other parts I decided on:
Geissele ssa trigger
Radian raptor vented charging handle
KAC unbreakable bolt catch, mag catch
Spikes 308 buffer tube, buffer spring and short 5.8oz 308 buffer
Beveled bcg (aero)- will have extra bolt since barrel comes with one.
Aero m5 stripped upper
Aero 308 dust cover
Bcm forward assist
Melonite gas tube spikes rifle length ar15(works with my barrel choice)
Aero m5 enhanced gen2 mlok rail 15in
Surefire 3 prong or warcomp to run RC1 and 300sps(in jail)
Law folding adapter gen 3- “it folds!”
Supurlarive arms bleed off gas block clamp on type (hope it fits under the rail?)
Aero or troy style ar15 flip up sight set
ergo grip-
Sopmod stock
Criterion 16in hybrid m118lr 1/10 w headspaced jp bolt

Tips/suggestions/criticisms all welcomed and appreciated.
Thanks!
I hope this will give my scar17s a decent run for the money.

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Don't ever buy anything Troy.

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Having a hell of a time finding a 15" handguard for the m5e1 in fde...

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Can you elaborate on that? What folding BUIS do you think are better and why?
You can’t expect people to just be like “oh ok, if you say so” when that is all you say.

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Read all of it if you want to know tl;dr won't cut it.
I had hoped that the truth about Troy Industries was known, at least on Arfcom.
FST

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Thanks for letting me know. Troy hired a LE sniper who shot a woman holding only a baby in her arms at Ruby Ridge.
I will go with the magpul mbus pro sights.

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Now i'm going to introduce you two to reality.

The fact of the matter is that the tolerance stacking of any reaction rod with receiver rail or takedown pin capture isn't going to overcome the allowable tolerance of the index pin notch.

They may limit movement and deformation of the notch by the pin when too much torque is applied, but they will not stop it from happening altogether.

In my world (being prior professional contract armorer and current DoD ordnance), i have yet to shear a single index pin ever, or see it happen ever. This includes the use of receiver blocks, barrel blocks, reaction rods, and some WECSOG shit we used to do back in the day.

The fact of the matter is that the PROPER use of torque and quality parts is the most important part of building.

If you are shearing index pins, you are DOING someing wrong, or have sub quality parts. Quality parts, when torqued to spec, do not shear pins.

Using an overly expensive build tool that actually allows you to hide the fact you have sub-quality parts or allows you to excessivly torque your equipment is NOT going to make you a better builder or make for a better gun.

Now, regarding the torque applied to the pin vs. receiver, etc., here's some tips.

If you have any play between the notch and index pin(side to side movememt, however small) this can lead to fsb misalignment as generally the play will favor one side more than the other.

To account for this, figure out which side the notch favors and choose the most appropriate build tool.

If the play is to the left (Operators Point of View or OPV. Meaning looking down the sight s from the rear towards the muzzle), you will want to favor the index pin to the right to keep the fsb/gas block from being canted left.

To do this, use a reaction rod type system as the barrel nut will make the receiver pivot with it to the left while keeping the index pin favored right.

If your index pin notch is excessive and favors right, use a reciever clamp system as this will cause the barrel and pin to turn to favor to the left.

Now for the best part. If you are building correctly with proper tools, parts, and following the procedure, if you only have a single retention method (let's say receiver clamps), you can actually hold the barrel to the side you wish by hand and apply the necessary torque to the barrel nut and the index pin will stay put.  Have a fellow armorer hold the fsb to the side you need while performing the final torque and it will stay where you need it to.

Meaning there is not enough torque applied to the index pin during a proper build procedure to sheer it off. Unless if course you are using shit parts or a good company happened to put out a rare lemon.

Remember, keep the interface between the barrel extension and receiver dry (you want friction here) and apply mil spec moly grease to the threads AND the face of the barrel extension that contacts the barrel nut to reduce friction and applied lateral force to the index pin, and keep your ugga duggas to the bare minimum as required by the instructions, procedure, or tech manual.

Everything else is a crutch or an excuse.

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For the crowd that is light years ahead of me...

what are my options for a different brand of handguard that will fit an M5E1... seems like finding an aero is almost impossible.

TIA

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First build for me.   Wanted to check in and make sure I was correct.  Looks like I can pick up the standard M5 upper, barrel and bolt from granite.   Is this SLR rail correct for that upper?  Will also be using one of SLRs adjustable gas block.  

Thanks

https://www.AR15.Com/media/mediaFiles/60593/Screenshot_20201105-112602_png-1670540.JPG

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Found a hand guard....whew

Now onto gas block and tube plus muzzle device.

Should I look for adjustable .750 block or any low profile? Are interchangeable ar15/10?

Stainless gas tube or any in rifle length?

Sorry very new at this

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I would go adjustable and the size depends on the barrel you have.  There's no AR10/15 difference, its the barrel size at the gas port (.750 potentially) that matters.  Again the gas tube depends on your barrel.

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Hmm.... think I made a mistake...

Ordered a surefire muzzle brake-suppressor adapter.

Dont have NFA toys and not sure I want to join that game.

Would this be fine to use without suppressor? Or should I find something else?

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But use it stand alone without issue?

Would a 3 prong be better?

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Wanting to buy a complete aero m5 upper.... Every time I look on aero's website they r out of stock.... Do they restock at a certain every day?

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Im trying to put together 6.5, but handguards are basically unobtanium right now. I should have bought the midwest I recommended to someone else.

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Anyone have a MI Combat Handguard on a M5 upper? Would you mind posting a picture of the mate up between the upper and handguard. I want to see how much of the barrel nut is exposed. The old MI you can see all the teeth on the nut, and IMHO it isn’t as pretty. Thanks in advance!!

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@monkeypunch, I have that exact combo going on a current build. I won't be able to get to it until Sunday the 29th, or so.

I will send you some pics and post here when I get this together. Someone else may get it to you earlier.

Right to Bear Arms had the MI handguards in stock just a week ago, aero lpk's, charge handles. Fast ship too. I was on a backorder at Midway for too long and glad I found a handguard when I did.

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@monkeypunch, no I got the 12.65" MI combat handguard, it's going on a faxon 16" barrel/Aero upper.

https://www.AR15.Com/media/mediaFiles/81766/2DDD50BB-8B61-4A87-A972-B4635EDA2D21_jpe-1702605.JPG

Just for reference this image is the exact same MI combat handguard, only in AR-15 size. It has the same barrel nut and same interface, locking piece, as the 308 version, just smaller.  It is not the same handguard that shows the barrel nut teeth.

I have the MI handguard on a PSA 308 build that does show the teeth, and yeah, not my favorite but it works.

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Who’s got a 12.5” build?

What barrel? If carbine length gas, how brutal is it?

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Nice

Not much in stock for 12.5 barrels