Ok here is what you need to do buy your barrel and bolt carrier whatever brand you want some are way better than other but that's more$$$,get yourself an ar15 multi tool and a set of vice blocks bolth of which you can get from brownells and a set of punches and hammer ball peen preferably.
And a torque wrench
1.remove handguards
2. Loosted flash hider don't remove it to protect thread
3. Take your punches and drive out the two gasblock pins from left to right there is no need to remove the gastube pin or gas tube
4. Remove flash hider and you may need to gently tap the gas block to Loosten it and remove gas block and gas tube as one unit
5 replace flashhider
6. Using the barrel nut portion of mulit tool loosen and remove the barrel nut and delta ring assembly... barrel nut fits inside delta ring
7. Remove old barrel
8. Replace with new barrel
9. Screw on barrel nut and delta ring and torque to 40 lbs. Be sure to check gastube allignment through the barrel nut,if its off increase by 5 lbs every time till alligned
10. Replace gasblock and gastube assembly. If using standard handguards the handguard cap goes on first
11. Drive fsb pins back from right to left
12 thread on flashhider and torque down
13 replace handguards and your done
As stated if you do not have any equipment yet you might spend just as much for everything as you would on a complete upper from BCM less BCG nad ch but its fun to do good luck and pm me if you have any ?'s
"Si Vis Pacem Para Bellum"
Semper Paratus AR-15 Armorer
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