AR Sponsor
Posted: 3/31/2009 10:00:31 AM EDT
|
On a recently completed 80% lower with a RRA two-stage trigger, the trigger does not release the hammer when the safety selector is installed and set in the "fire" position. The rest of the function test appears to pass without any problem. Also, doing the following (highlighted items give unexpected results and are discussed below):
Double check your assembly then dry cycle the lower by hand to check for mistiming between the disconnector hook and the middle hammer hook. The tip of the disconnector should almost touch the middle hammer hook when you cock the hammer by hand. Keep something soft, like your thumb, between the hammer and the lower in case the hammer slips. Do not allow the hammer to strike the lower. With the hammer cocked onto the disco, slowly release the trigger. The hammer should jump up slightly and now be resting on the tip of the trigger. Repeat this several times. The hammer should not fall. With the trigger pulled to the rear, push the hammer as hard as you can against the top of the disconnector, the middle hammer hook and the tip of the disconnector will separate vertically but should not separate enough horizontally to allow one hook to miss the other. Make sure that the disconnector slides easily in the trigger and make sure that the disconnector spring is present and correct. (link)
...gives the following results:
Is this an appropriate solution? Also, do the unexpected results listed above raise any concerns? I haven't tried live firing it yet. |
| Here's a picture of the RRA two-stage trigger: http://www.rainierarms.com/?page=shop/detail&product_id=395 |
|
Complete newb here, but a buddy just helped me finish my first build (on a 100% rec.)
Upon completion mine also failed that test simply because you had to push REALLY hard to get the disconnector to move. After the gun was assembled, dry fired, and cycled about a dozen times the mechanism loosen up and now it works perfectly. YMMV. |
|
Quoted:
On a recently completed 80% lower with a RRA two-stage trigger, the trigger does not release the hammer when the safety selector is installed and set in the "fire" position. The rest of the function test appears to pass without any problem. Also, doing the following (highlighted items give unexpected results and are discussed below): Double check your assembly then dry cycle the lower by hand to check for mistiming between the disconnector hook and the middle hammer hook. The tip of the disconnector should almost touch the middle hammer hook when you cock the hammer by hand. Keep something soft, like your thumb, between the hammer and the lower in case the hammer slips. Do not allow the hammer to strike the lower. With the hammer cocked onto the disco, slowly release the trigger. The hammer should jump up slightly and now be resting on the tip of the trigger. Repeat this several times. The hammer should not fall. With the trigger pulled to the rear, push the hammer as hard as you can against the top of the disconnector, the middle hammer hook and the tip of the disconnector will separate vertically but should not separate enough horizontally to allow one hook to miss the other. Make sure that the disconnector slides easily in the trigger and make sure that the disconnector spring is present and correct. (link)
...gives the following results:
Is this an appropriate solution? Also, do the unexpected results listed above raise any concerns? I haven't tried live firing it yet. There are multiple posts about some issues with RRA triggers and selectors. See my photo I attached below. If I read this correctly, then you're choices are. 1) file the FLAT AREA (the notch) in the selector down slightly 2) file the area in the photo down slightly (i opt for #1 as its safest and cheapest to replace) 3) send trigger back to RRA for replacement I can say I had this issue and I did option #1 and only a slight bit of material taken off and im rock solid 100%. You want to pay attention to how much over travel you have with the selector out and then file to produce that over travel (or I suppose whatever kind of over travel you prefer, but a tiny tiny bit is at least needed) Filing the FLAT (notch area) of the selector will in no way affect your selectors ability to put the weapon in a SAFE position. That is controlled by the diameter of the shaft as when its in SAFE the rounded area is against the trigger. You know? 
|
|
Agro, thanks for the reply! I'll go ahead and modify the selector as you suggest. There is very little over travel necessary, and I wouldn't even come close to the point of reducing the diameter of the selector in order to make the fix (if that makes sense). <$10 for the selector is definitely a cheaper replacement in case I mess up...
I'll post my results in a week or two after I get the chance to work on this. |
AR Sponsor