Is the MP15 Sport a good rifle for a first time AR owner?
Yes. It is a good rifle for a first time AR owner. The 15-Sport was my first AR-15. I own it to this day, and it is the only brand name AR-15 I own.
Now i have had some friends suggesting to build my own AR, but i dont really know alot about them to build my own
While I am an advocate of building your own rifle, you sound like the perfect candidate for a factory complete AR-15. Why? It is better for you to buy a factory complete rifle from a well known brand that has the resources to back their warranties. If there is any defect in the manufacture of the rifle, you make a call to the manufacturer. Anything breaks (not user induced), you make a call to the manufacturer. Right out of the box, you're ready to start learning about the AR-15 and earning experience. IMO, better to start your AR-15 enthusiasm in the most problem free way.
Second piece of advice, there are several different AR-15 manufacturers. The seemingly endless options will make a potential AR-15 enthusiast's head spin. Again, I highly recommend buying an affordable AR-15 from a well known brand name. Most people don't consider the other basic supplies and gear you'll need to support an AR-15:
- Ammunition. For range plinking, I highly recommend Wolf Gold.
- Magazines. I usually stick to P-Mags or D&H aluminum mags. I buy when they're on sale. If you're going to shoot from a bench or rest, look to buy a couple 10 or 20 round mags to make it easier.
- Rifle Bag. The Condor style single or double rifle bag is nice.
- Sling.
- Cleaning supplies: Otis flexible rod cleaning system, chamber brush, solvent, lube, etc...
Resist the urge to start swapping out parts and furniture right away. Put some rounds downrange and discover your preferences. Pay attention to what feels good and what does not. That way you don't make the mistake of buying an accessory because it looks good and ends up not feeling good. I made this mistake over and over again. Shoot your rifle as it is out of the box. Shoot irons for a bit before adding an optic.
For an affordable AR-15, I highly recommend the S&W M&P 15-Sport. The buy-in price leaves money left over for the other necessary purchases.
Remember, you're looking to buy your first AR-15. For most AR-15 enthusiasts, the first isn't the last. Good luck in your search.