problem assembling ar lower-SOLVED

[DoctorLove]

Trying to install a pistol grip, and the pistol grip screw hits a stop before the pistol grip is tight (maybe 1/8" left to go). I looked into the lower and see that the threads don't run the entire length of the hole to the other side (fire control pocket). Instead it stops maybe 1/4" short of the end of the "tunnel" and that's where my screw is stopping. So my question is this- Is my pistol grip screw (PSA, threaded portion measures 1") too long, or should the pistol grip screw hole be tapped all the way down the hole on my lower (anderson mfg.)

EDIT: Bought a shorter screw, pistol grip locked in. Thanks to everyone who responded

[Cadre]

Washer.

[DoctorLove]

washer is in place. still an 1/8" gap

[Niviticus]

Is it an Anderson lower from turners sale? Some of those didn't have the hole threaded all the way through. Either get a shorter screw, cut the screw or use washers.

[Cadre]

washer is in place. still an 1/8" gap

Use a thicker one or cut screw

[DoctorLove]

I know those are options but I'm asking someone to check on their AR to confirm either that my screw is longer than usual or that the grip screw hole is supposed to be tapped all the way through. Just want to know whats what

[tujungatoes]

I don't think there's a spec for that. Probably just tolerances between manufacturers. If it were me(and it's not) I'd grab a tap and finish threading it all the way out.

[atwomoto]

Yes the screw is about an inch long. you can just finish the threads with a tap if you feel confident in your ability to do so.I will warn you that if the screw goes past the inside of the threads, you may have interference problems the the safety selector and the rear of the trigger. If for what ever reason you got a flawed grip that is to short on the inside thats another problem. is the grip a stock unit? If so try an aftermarket grip, there are a ton to chose from. i personally like the Ergo Grips they have a great feel and are not to hard on the wallet. good luck

[tanakasan]

Tap the receiver deeper or use a shorter screw/cut your screw down. Watch for 1/4-20 coarse thread vs 1/4-28 fine thread. I have seen both in lowers.

Robert

[Junkie]

Most are tapped all the way through but some aren't.

I've never seen 1/4-20 in a receiver but I haven't looked at all that many.

[Clipper]

I have seen the threads stop short and i have seem them go all the way through. I think i would just head to the hardware store and get a shorter screw, that's easier than tapping deeper.

[SMarquez]

3/4" long 1/4-28 screw and be done with it.
This has come up before. I don't get that someone can take on building a lower, run into this and then come running to CG to discuss. It has even been a several page rant on QC and Anderson vs. high end names and so on.
Take the screw with you to Lowe'sHomeDepotAceDoitCenter and look for the next shortest screw. It will be quicker than posting and reading the follow up responses.

[19K]

Just use a thicker washer. I've done it and it works fine.

[Click Boom]

I know those are options but I'm asking someone to check on their AR to confirm either that my screw is longer than usual or that the grip screw hole is supposed to be tapped all the way through. Just want to know whats what

Spare Aero Precision Lower Here - Pistol Grip screw hole goes all the way thru.

[DoctorLove]

Bought a shorter screw. Thanks for all your responses. Learned something new today