Do I need a Torque wrench

[cgrutt]

Also note if you're using an attachment such as this to tighten barrel nut

The torque value that is set on wrench has to be adjusted to achieve specified torque value at barrel nut. The adjustment depends on BOTH distance from the "jaws" (for lack of a better term) of barrel nut attachment to the square drive AND the angle that torque wrench is attached to the barrel nut attachment. This is also the case for crows foot attachments as well as other extensions etc. I dont know the math offhand but its widely available online.

ETA here is example in this case you need to set wrench at 117 ft lbs (Y) to achieve 135 ft lbs (T) at nut. Note this shows torque wrench attached to crows foot along same centerline the math is different if attached at angle...

 

[Calculon]

I just figured if we convince him to buy one he’ll see the wisdom in a torque driver for scopes!

 

[Daso]

I just figured if we convince him to buy one he’ll see the wisdom in a torque driver for scopes!

With all the wisdom here I've come to the following conclusion. I'm definitely buying a torque wrench for my scope mounts and small jobs, but due to a lack of space and additional equipment (vice, vice block, torque wrench for bolt lug) I think I will have a shop do the floating hand guard install for now. I can get all the parts off, it getting them back on properly that I'm concerned about without stuff shaking loose) It'll cost me $25 and as much as id like to do. It myself doesn't seem practical for now. I definitely get having the right tools and it makes sense. I might swap barrels once but unlikely to do that much as I primarily shoot pistols. Thanks all. Ps what size wrench is needed for a barrel lug anyway.

 

[BDinPutnam]

Good point, @cgrutt. It took me a little doing on my first one (because I'm bad at math, lol).

@Daso, I don't have one so cant recommend one or say if they're any good for this application, but they do make vises you can clamp onto the table and remove after you're done. If you are going to do anything with barrels/ handguards I would definitely recommend an upper block, which are cheaper enough. I like to wrap the upper in a light towel before putting in the block to protect it from getting blemished by the block itself. If you really want to get precise and be OCD as hell you can also buy a reaction rod but the good ones I've seen are pricey and I never saw the need.

But 25 bucks for peace of mind is cheap enough for sure!

 

[Mosinitis]

Barrel nut installation you need a good size vise mounted on a solid work bench, (forget kitchen table). You need clamshell block for the receiver and a good barrel nut wrench, torque wrench is not necessary. You are tightening barrel nut until hole for the gas tube in the receiver and "U" in the nut line up. It's not going to be any specific torque value.
Looks like OP made the right decision.

 

[gun_slinger_boy]

I might swap barrels once but unlikely to do that much as I primarily shoot pistols.

Do you ever remove/mount tires on your car? Do you have a motorcycle? Work on your car or bike engine? Change your oil? Rotate tires? Have to fend off goons in a home invasion? It's a useful tool.

 

[Daso]

Thanks everyone. All advice and points taken. Appreciate it. I've learned a lot in a short time. Definitely getting torque wrench for sights but leaving handguard and barrel to a Smith with proper tools.

 

[repete]

FWIW you can get a torque wrench at Harbor Freight for $19.99 in 1/4, 3/8, or 1/2 inch. 4 star rated . . .

It's like their wheel barrow program.

Good to know! I've got some cement to mix and I'd rather mess up theirs then mine.

 

[toxophilite]

Also, I think about warranty. You mount your scope and it doesn't seem to keep its zero..or it slipped during recoil..or remount to another base or gun but won't screw in correctly. "DID YOU TORQUE IT TO SPEC?" -optic company

 

[Daso]

Also, I think about warranty. You mount your scope and it doesn't seem to keep its zero..or it slipped during recoil..or remount to another base or gun but won't screw in correctly. "DID YOU TORQUE IT TO SPEC?" -optic company

No question at all that I'm buying the torque wrench set for sights etc..

 

[GOYABEAN]

No question at all that I'm buying the torque wrench set for sights etc..

Sights sights you don't need no stinking sights AR bullets are self guided