I think I'm going to get a Rock River Predator Pursiut, but the one I found has a standard stock. Can I swap that out with just about any adjustable stock, or do you have to stick with whatever RR offers? Same thing for handgaurds?
Are most AR parts changable regardless of maker?
- Thread starter greydarrah
- Start date
Re: Are most AR parts changable regardless of maker?
buffer tubes differ in size from mil spec to commercial. make sure you get the correct stock for your buffer tube.
buffer tubes differ in size from mil spec to commercial. make sure you get the correct stock for your buffer tube.
Re: Are most AR parts changable regardless of maker?
Some are, some are not! Im not sure about RR, just make sure before you buy!
Some are, some are not! Im not sure about RR, just make sure before you buy!
Re: Are most AR parts changable regardless of maker?
Almost all parts interchange on AR-15s, the ones that don't are usually due to being at different ends of the specs tolerance, or poorly made and out of spec, rarely but occasionally there are proprietary parts, generally major components.
As far as installing a collapsible stock onto a RRA its not problem at all. If you are buying components seperately make sure buffer tube and stock match, as in both commercial or both mil-spec. FWIW I suggest milspec, while almost all are offered in both these days new designs usually arrive in mil-spec first.
Almost all parts interchange on AR-15s, the ones that don't are usually due to being at different ends of the specs tolerance, or poorly made and out of spec, rarely but occasionally there are proprietary parts, generally major components.
As far as installing a collapsible stock onto a RRA its not problem at all. If you are buying components seperately make sure buffer tube and stock match, as in both commercial or both mil-spec. FWIW I suggest milspec, while almost all are offered in both these days new designs usually arrive in mil-spec first.
Re: Are most AR parts changable regardless of maker?
+1 from the posts before me. If you're not sure, take your (unloaded) rifle to your nearest gun store and have them figure out what options you can have.
+1 from the posts before me. If you're not sure, take your (unloaded) rifle to your nearest gun store and have them figure out what options you can have.
Re: Are most AR parts changable regardless of maker?
Forgive my stupidity (first AR), but what is the difference from mil spec and commercial, and how do you tell which one your rifle is?
Forgive my stupidity (first AR), but what is the difference from mil spec and commercial, and how do you tell which one your rifle is?
Re: Are most AR parts changable regardless of maker?
Grey, we have two of the PPs in our group that have the A2 stock which uses the rifle buffer tube,buffer, and buffer spring. The PP balances very well with the A2 stock so you should try it out, but if you want the carbine stock you will need to buy not only the stock, but the correct buffer tube,spring and buffer. Regards
Grey, we have two of the PPs in our group that have the A2 stock which uses the rifle buffer tube,buffer, and buffer spring. The PP balances very well with the A2 stock so you should try it out, but if you want the carbine stock you will need to buy not only the stock, but the correct buffer tube,spring and buffer. Regards
Re: Are most AR parts changable regardless of maker?
The vast majority of parts are interchangeable. Here is a list of things that are occasionally different:
Front sight blocks have different heights depending on the length of sight radius and whether they were meant to match up with A1/A2 rear sights or flat top sights. Either get a matching pair or get the right FSB to match your existing rear.
The military buffer tube is smaller diameter than the commercial tube. Stocks meant for the military tube won't fit on the larger commercial tube. Stocks meant for the commercial tube fit loosely on the smaller military tube. Commercial tubes usually have 6 positions and a slanted back. Military tubes usually have 4 positions and a flat back. Mil-spec is preferred as it was the original and has the most options. Commercial works fine too but has less future options. Most important is to match the right stock to the tube which is accomplished simply by buying them together as an assembly. If you want to change your existing stock to a new one, then it will matter what your existing tube is.
Pre-ban and ban-era Colts can have different trigger, hammer, pivot, and takedown pins. There can also be a block in the lower receiver preventing installation of certain parts such as aftermarket triggers.
Some uppers have unusually high flat tops intended to prevent the additional expense of getting a riser rail for low-mounted optics. The extra height is usually very obvious.
Those are the most common differences I can think of at the moment.
The vast majority of parts are interchangeable. Here is a list of things that are occasionally different:
Front sight blocks have different heights depending on the length of sight radius and whether they were meant to match up with A1/A2 rear sights or flat top sights. Either get a matching pair or get the right FSB to match your existing rear.
The military buffer tube is smaller diameter than the commercial tube. Stocks meant for the military tube won't fit on the larger commercial tube. Stocks meant for the commercial tube fit loosely on the smaller military tube. Commercial tubes usually have 6 positions and a slanted back. Military tubes usually have 4 positions and a flat back. Mil-spec is preferred as it was the original and has the most options. Commercial works fine too but has less future options. Most important is to match the right stock to the tube which is accomplished simply by buying them together as an assembly. If you want to change your existing stock to a new one, then it will matter what your existing tube is.
Pre-ban and ban-era Colts can have different trigger, hammer, pivot, and takedown pins. There can also be a block in the lower receiver preventing installation of certain parts such as aftermarket triggers.
Some uppers have unusually high flat tops intended to prevent the additional expense of getting a riser rail for low-mounted optics. The extra height is usually very obvious.
Those are the most common differences I can think of at the moment.
Re: Are most AR parts changable regardless of maker?
This sure can get complicated...at least for your first time.
I was going to buy the RR Predator Pursuit from an online dealer and have it shipped to a local FFL (thus avoiding the 3 to 4 month wait directly from RR). But the one I found comes pretty much stock, as RR builds it, and I don't like that full butt stock, and doubt the dealer will change it. So, I thought I'd order the PP 20" complete upper and the RR complete lower with the stock I want. Now I'm faced with a new unknown...I have 2 trigger options. One lower comes with a Geissele 2 stage trigger, and the other has a 2 Stage National Match trigger (both are RR lowers). Can anyone tell me if one is better than the other?
Finally, do separately purchased upper and lowers always go together smooth as silk, or do you sometimes have to find a gunsmith that needs to fine tune the fitting?
This sure can get complicated...at least for your first time.
I was going to buy the RR Predator Pursuit from an online dealer and have it shipped to a local FFL (thus avoiding the 3 to 4 month wait directly from RR). But the one I found comes pretty much stock, as RR builds it, and I don't like that full butt stock, and doubt the dealer will change it. So, I thought I'd order the PP 20" complete upper and the RR complete lower with the stock I want. Now I'm faced with a new unknown...I have 2 trigger options. One lower comes with a Geissele 2 stage trigger, and the other has a 2 Stage National Match trigger (both are RR lowers). Can anyone tell me if one is better than the other?
Finally, do separately purchased upper and lowers always go together smooth as silk, or do you sometimes have to find a gunsmith that needs to fine tune the fitting?
Re: Are most AR parts changable regardless of maker?
Don't be scared... very vast amount of parts are interchangable
Don't be scared... very vast amount of parts are interchangable
Re: Are most AR parts changable regardless of maker?
RRA uses mostly commercial grade buffer tubes. As recently as a year or so ago anyway but they do have a lot of new offerings since.
One thing to note that I don't think has been mentioned is that either a mil spec or a commercial grade buffer tube can be installed on an RRA lower. That is, the thread size is the same on the lower and the tube, its the tube size that is different. So even if you accidentally by the wrong stock and for some reason can't or don't want to take it back, you can always just go ahead and upgrade by buying a mil spec spring and buffer kit, install it and then it will slip right on. But as mentioned before, just bring the lower to a shop and have someone try and slip a mil spec and a commercial grade one on and see which one fits.
I bought a complete RRA lower about a year ago or so to start a build. It had a commercial grade tube and adjustable stock. I ended up stumbling onto a screaming deal on a complete Vltor set up on clearance which came with a spring, tube, buffer and stock that i couldn't pass up for the money. It was all mil spec and fit nicely. Just FYI
RRA uses mostly commercial grade buffer tubes. As recently as a year or so ago anyway but they do have a lot of new offerings since.
One thing to note that I don't think has been mentioned is that either a mil spec or a commercial grade buffer tube can be installed on an RRA lower. That is, the thread size is the same on the lower and the tube, its the tube size that is different. So even if you accidentally by the wrong stock and for some reason can't or don't want to take it back, you can always just go ahead and upgrade by buying a mil spec spring and buffer kit, install it and then it will slip right on. But as mentioned before, just bring the lower to a shop and have someone try and slip a mil spec and a commercial grade one on and see which one fits.
I bought a complete RRA lower about a year ago or so to start a build. It had a commercial grade tube and adjustable stock. I ended up stumbling onto a screaming deal on a complete Vltor set up on clearance which came with a spring, tube, buffer and stock that i couldn't pass up for the money. It was all mil spec and fit nicely. Just FYI
Re: Are most AR parts changable regardless of maker?
As for the trigger options, Geissele is pretty much gold standard. If it's offered go with them over the RRA triggers and you can't go wrong.
As for the trigger options, Geissele is pretty much gold standard. If it's offered go with them over the RRA triggers and you can't go wrong.
Re: Are most AR parts changable regardless of maker?
Do separately purchased uppers and lowers always fit together with ease (both would be RRA) and does buying them separately ever effect accuracy?
Do separately purchased uppers and lowers always fit together with ease (both would be RRA) and does buying them separately ever effect accuracy?
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