MRA renegade barrel swap issue

Belvedere

Belvedere

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Grand Forks, BC
Got a mra renegade and wanted to swap a 18.5 barrel on to it. (18.5 Barrel was from a semi auto)
Issue I ran into is I cant cycle the action, but can remove the barrel easy enough.

Any help or insight would be appreciated
 
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Is your new barrel a standard AR15 barrel with barrel extention? If so, it should work fine. Check for burrs in the barrel extention or alignment. You can compare that with the old barrel.
 
No burrs found. Oiled everything generously, back to not cycling so pulled it apart whipped everything down assembled and cycles.
So that being said would it just be tight tolerances?
 
Pull the bolt out of BCG and cycle it as a test. Did you use an AR cam pin or the MRA cam pin? Think there was some problems with some AR cam pin manufacturers, different tolerences.
 
notsorichguy said:
Did you remember to remove the gas rings and install the required "helper spring" on the tail of the bolt?

What you are describing is precisely the issue the "helper spring" is there to alleviate...

Cheers?
Click to expand...
What’s the purpose of this spring? What’s the official name for it?
 
AirForceOne said:
What’s the purpose of this spring? What’s the official name for it?
Click to expand...
Without the spring it makes the bolt difficult to operate. Like mortar the rifle difficult Doubly so if you left the gas rings on the bolt.

As for the name… I have no idea… I don’t have the assembly manual anymore… if I had to guess, and I was talking to someone from MRA, I would call it a “Bolt-tail spring”…
 
Ahh I see, I am guessing this is because there is no gas flowing through the BCG in order to turn the cam pin and unlock the bolt, so it uses spring pressure to get that rearward movement
 
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