Short answer: upgrade in the order that changes how you shoot the most: 1. an optic (a red dot), 2. a sling, 3. a weapon light, 4. a trigger, then 5. a charging handle and 6. grip and stock for fit. That is our recommendation, not a rule. In our catalog on 24 October 2026 the middle half of red dots cost $170 to $550, triggers $112 to $240 and slings $20 to $58.
The upgrade order
1. Optic
A red dot makes it faster to get on target and easier to shoot accurately than iron sights. See what a red dot is and the best red dots.
2. Sling
Cheap and useful: a sling lets you carry the rifle hands-free and steadies it when you shoot. See single-point vs two-point slings.
3. Weapon light
For any defensive use you need to see what you are aiming at. See the best weapon lights.
4. Trigger
A better trigger gives a cleaner break and shorter reset; a coated mil-spec style trigger such as the ALG ACT keeps a duty-style weight. See the best triggers and our ALG ACT review.
5. Charging handle
An ambidextrous or extended-latch handle is easier to work with an optic mounted. See the best charging handles.
6. Grip and stock
These change fit and comfort more than performance: see pistol grips and stocks. For first-day gear rather than upgrades, see the accessories checklist.
One pick per upgrade, with today's prices
Lowest price across the stores we track:
Sig Sauer Romeo5 Gen II 2 MOA
Pros
- Compact tube red dot, 2 MOA
Cons
- Green-dot model on this listing
1. Optic
Blue Force Gear Vickers VCAS sling
Pros
- Two-point quick-adjust sling
Cons
- Two-point only
2. Sling
Streamlight ProTac Rail Mount HL-X
Pros
- 1,000 lm, 50,000 cd (Streamlight)
Cons
- Mount position matters
3. Light
ALG Defense ACT trigger
Pros
- About 6 lb, coated, single stage
Cons
- Not a light match pull
4. Trigger
Radian Raptor ambidextrous charging handle
Pros
- Latches on both sides
Cons
- Black on this listing
5. Charging handle
Magpul CTR stock, FDE
Pros
- Collapsible mil-spec carbine stock
Cons
- Mil-spec tube only
6. Stock
B5 Systems P-Grip 22, coyote brown
Pros
- Pistol grip, 1.90 oz (B5)
Cons
- Coyote brown on this listing
6. Grip
Price your whole rifle in the AR-15 builder.
Frequently asked questions
What is the first upgrade for an AR-15?
An optic, usually a red dot: it changes how fast and accurately you shoot more than any other part.
Is a trigger upgrade worth it?
Yes, once you have an optic, sling and light. A cleaner break helps accuracy; pick the weight that suits your use.
What AR-15 upgrades are cheap?
Slings and pistol grips: in our catalog the middle half of slings cost $20 to $58 and grips $16 to $35.
Should I upgrade the barrel first?
Usually not: a factory barrel is fine for most shooters until you have the optic and basics sorted.
How much do AR-15 upgrades cost?
In our catalog the middle half of red dots cost $170 to $550, lights $148 to $341, triggers $112 to $240 and charging handles $50 to $100.
