Spaniky73 Posted December 11, 2011 Report Share Posted December 11, 2011 I just purchased a LAR-8. I am curious what parts are interchangeable with other platforms. Also what after market parts are out there; stocks, buffers, ect... I am aware that the Magpul PRS will work but you have to modify the cheek piece. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted December 11, 2011 Report Share Posted December 11, 2011 You're kind of on the right track. Most stocks and pistol grips work. Triggers are also pretty universal. The PRS comes in two version 7.62 and 5.56, there's no modification necessary. Hand guards, barrel nuts are rifle specific. Also the bcg is type specific. Barrel devices differ from AR15's to large format AR's and caliber. What exactly are you looking for, maybe we can help??? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 11, 2011 Report Share Posted December 11, 2011 Still have to cut the 7.62 PRS to get it to work with the RRA .308s. They have a longer charging handle, which comes back further... Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 11, 2011 Author Report Share Posted December 11, 2011 I would love to find out what other stocks and buffers are available mainly. I also want to know what other parts are out there that I do not have to go through RRA for. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted December 11, 2011 Report Share Posted December 11, 2011 Got a Lar-8 also brother Spaniky how long did you have to wait?Cons yea a few parts are proprietary,Pros ya got a Rock River the guys would know more than I would about mix and match am curious also.Shoot on bro. Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 11, 2011 Author Report Share Posted December 11, 2011 I didn't wait at all. I got a sizable gift certificate to Impact Guns from my family as an early Christmas gift while I was home on leave. I walked in and they had one on the wall. Also I am not looking to change out much. I would like to see what is available. Quote Link to comment Share on other sites More sharing options...
Dusty44 Posted December 12, 2011 Report Share Posted December 12, 2011 A CAA grip (Brownell's) is one of the nicer things I did for my DPMS factory rifle. The grip is relatively inexpensive; has three inserts for the front edge and three inserts for the back edge to give you the best feel and hold. A couple of minutes work to sort out and assemble to your rifle. Fit it to the rifle alone: that second spring (trying to escape from the bottom of the receiver) will cause some noises not fit fer wimmen ner chilldrun to hear. 'Course, CAA might have put a seat into the grip by now for that second spring. But that would make it too easy. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 12, 2011 Report Share Posted December 12, 2011 Like Robo said above, the basic parts that will interchange into the RRA guns from the other .308 ARs will be triggers, lower parts kits, pistol grips, and stocks. Any kind of back up sights will work, as long as they attach to a Pic rail piece. The RRA barrels are threaded 5/8" x 24, so muzzle devices will cross over. BCGs and charging handles will not cross over. Rails will not cross over. DPMS and Armalite pattern barrels will not cross over. Here's the Big Warning from RRA:http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=451Also, check this NOTE written on the free float tube page about upper receiver threading:http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=537 Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 12, 2011 Author Report Share Posted December 12, 2011 I have read the disclaimer from RRA. Like I said before, I am in the market for stocks and buffers at the moment. I am also just trying to see what else is out there. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 12, 2011 Report Share Posted December 12, 2011 I would love to find out what other stocks and buffers are available mainly. I also want to know what other parts are out there that I do not have to go through RRA for.This is what I was providing for you. Measure the length of the buffer you have currently, provide that measurement, and then you can compare what else is available. Stocks have already been covered. Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 12, 2011 Author Report Share Posted December 12, 2011 This is what I was providing for you. Measure the length of the buffer you have currently, provide that measurement, and then you can compare what else is available. Stocks have already been covered.Sorry if I am being thick headed but you are saying that the stocks for most of the 308 platforms will cross over. I will mesure my buffer today. Thank you. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 13, 2011 Report Share Posted December 13, 2011 They all mount on a receiver extension that's the same length as the AR-15. The RRA BCG is longer, so I suspect the buffer is shorter, so they can both fit into the same length of space - no other way it can work. Not sure what options you'll have for buffers... <dontknow> Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 15, 2011 Report Share Posted December 15, 2011 Confirmed that the RRA buffer is shorter - Slash (HeavyBuffers.com) offers a special buffer for the Rock River .308 firearms. <thumbsup> Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 19, 2011 Author Report Share Posted December 19, 2011 Thank you. Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 25, 2011 Author Report Share Posted December 25, 2011 Are the gas blocks RRA only or can you swap them out with other brands? Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted December 25, 2011 Report Share Posted December 25, 2011 i would assume, i know, but it is measured like normal, the thickness of where it's mounted on the barrel. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 25, 2011 Report Share Posted December 25, 2011 They should be standard. Four sizes pretty much cover the entire industry: .625" // .750" // .875" // .936" Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted December 25, 2011 Report Share Posted December 25, 2011 Ive never seen a .625 gas block on a .308 type AR. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 26, 2011 Report Share Posted December 26, 2011 I haven't, either - that's just the stuff available for the 15s, and those parts are the same (different sizes that will come up in a search for him). That would be a lightweight .308 barrel... <thumbsup> Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted December 29, 2011 Author Report Share Posted December 29, 2011 I spoke with RRA tech department and found out that the gas block on a RRA chrome molly is .750. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted December 30, 2011 Report Share Posted December 30, 2011 Based on that info, man, you could literally Google "AR-15 .750 gas block," and anything you find will work on your rifle. Only two things gas block-related) would need to be considered: 1. is the gas block I'm looking at going to fit under my freefloat rail/handguard? (if you're going that route), and 2. What gas tube am I going to need for this barrel?2nd question I put up there, just because I have no idea what gas system lengths RRA uses on their .308s. I'm not sure if they're some proprietary, weird length or not - that's definitely something to research. <thumbsup> Quote Link to comment Share on other sites More sharing options...
Hoot Posted December 30, 2011 Report Share Posted December 30, 2011 I don't think RRA's gas tubes are proprietary. I just set my Predator HP up with a 260 Remington barrel and having removed the stock 308 barrel, block and tube, I laid the tube next to a generic one I purchased for the new barrel. They're the same length, with the same bends.In the case of mine, it is a rifle length tube. I can't comment on shorter gas systems. I'm not into window dressing my rigs and for a reasonable price, the Troy low profile, blackened Stainless Steel gas block I bought from Midway for the 260 bull barrel, fits beautifully under the stock handguard that comes with the rifle. Before it arrived, I was using an aluminum quad-rail block I had laying around for testing. In order for a portion of it to fit in, under the handguard, I had to mill down one picatinny island at the end. Not sure what the sections between the slots on a picatinny are called. The .936 Troy block I got was well made, with a nice, close-tolerance fit.Here what the .750 one looks like.Hoot Quote Link to comment Share on other sites More sharing options...
99airforce Posted January 4, 2023 Report Share Posted January 4, 2023 I have a rra lar-8 carbine. I want to change out the mid length hand guard. I can't find one that's 8 1/4. It looks as if I will need to change out the gas block for one that's lower, and find a free floating type. But I was informed the barrel nut it specific to the lar-8. Can anyone help me out here! Quote Link to comment Share on other sites More sharing options...
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