Few teams have the type of success with undrafted free agents like the San Diego Chargers.  In fact, at least one has made the team for the past 18 years, including four a year ago.

With the 2016 NFL Draft officially in the books, the Bolts have added the following 20 college free agents:

QB Mike Bercovici – Arizona State

The former Sun Devils QB has a powerful arm, and is known for zipping it all over the field. He threw for 5,332 yards and 42 touchdowns over his four year career including a breakout season in 2015 with 3,854 yards and 30 TDs last season.

CB Terrell Chestnut– West Virginia

One of two Mountaineers who have agreed to terms, Chestnut is a 5-11, 188-pound corner who had a career-high three interceptions and two forced fumbles in 2015.

RB Kenneth Farrow – Houston

A three-year captain for the Cougars, the 5-10, 220-pound running back carried the rock 560 times for 2,975 yards and 34 touchdowns, averaging 5.3 yards per carry.  He also caught 74 passes for 546 yards through the air.

OT Tyler Johnstone– Oregon

After a knee injury cost him all of 2014, the 6-6, 295-pound Johnstone returned to form at left tackle in 2015 for the Ducks.  He was a first-time All-Pac-12 pick last year, playing a pivotal role on an Oregon team e that ranked fifth in the nation in total offense, rushing, and scoring. Johnstone started all 39 games he appeared in over three seasons,

G Sebastian Johansson - Marshall

The 6-5, 284-pound guard appeared in 12 games last year, notching 36 knockdowns in 773 snaps.

WR Jamaal Jones– Montana

Jones is a 6-1, 192-pound wideout who is Montana's all-team leader in career receiving yards with 3,021 amassed over three seasons.  He caught 1,217 yards and 11 TDs in 2015.

OLB Chris Landrum– Jacksonville State

A 6-3, 260-pound edge rusher, Landrum played defensive end for the Gamecocks and recorded 64 tackles, 19.0 tackles for loss and 8.5 sacks a year ago.

G Mike McQueen - Ohio

McQueen is a 6-7, 287-pound mauler who made a name for himself with the Bobcats.

S Adrian McDonald – Houston

McDonald was a 2015 Jim Thorpe Award Semifinalist, which is given to the nation's top defensive back.  The 5-11, 205-pound safety and team captain ranks first in school history with 17 career interceptions, and ranked second on the team in 2015 with 92 tackles.

OLB Tyler Marcordes – Georgia Tech

The 6-4, 237-pound Marcordes started all 12 games last year for Georgia Tech, and ranked third on the team with 51 tackles while tying for the team lead with 6.5 tackles for loss.

C Spencer Pulley – Vanderbilt

Pulley appeared in 50 games over his career with the Commodores, and the 6-4, 300-pounder notched 35 pancake blocks in 2015.

LB Shaq Petteway– West Virginia

The 6-0, 230-pound former Mountaineer totaled 153 tackles and 20 tackles for loss, battling back from a knee injury in 2013 that cost him the entire season.

OT Zeth Ramsay – Colorado Mesa

The 6-6, 280-pound Ramsay earned All-Colorado Honorable Mention Academic Honors in 2015, starting all 11 games at right tackle.

WR Deandre Reaves– Marshall

In addition to being a threat at wide receiver, the 5-10, 179-pounder was one of the most dangerous kick returners in the nation over his career with the Thundering Herd.

CB Larry Scott – Oregon State

Scott played in 31 games over his career, totaling 72 tackles, 15 passes defensed and one pick for the Beavers.

RB Chris Swain – Navy

A bruising 6-0, 247-pound rusher who also played fullback, Swain set career-highs with 1,023 yards and 10 touchdowns last season.

TE Matt Weiser – Buffalo

A former teammate of Branden Oliver's at Buffalo, Weiser caught 92 passes for 1,080 yards and eight touchdowns over four seasons with the Bulls.

WR Dominique Williams – Washington State

The productive 6-2, 200-pound receiver left Washington State ranked third all-time with 192 catches, second all-time with 2,889 yards and second all-time with 30 touchdown catches.  His 30 TD receptions are tied for seventh in Pac-12 history, and he set career-highs last season with 75 catches for 1,040 yards and 11 touchdowns.

CB Trevor Williams– Penn State

An All-Big Ten honorable mention selection, the 6-0, 200-pound Williams had 33 tackles, four passes defensed and one pick in 2015.

DE Carlos Wray – Duke

Appearing in 49 games over four seasons, the 6-2, 290-pound Wray totaled 120 tackles, 7.0 tackles for loss and 2.5 QB sacks over his Blue Devils career.  His top performance came in the 2015 New Era Pinstripe Bowl when he had a career-high eight tackles against Indiana.